EP3726932A1 - Method for frequency-variable control of the colour appearance and/or the luminous flux of a lighting system - Google Patents

Abstract

The invention relates to a method for variable-frequency control of the light color and / or the luminous flux of a lighting system (1), the lighting system (1) comprising at least two light sources (2) of different light colors, a microcontroller (2) being used to control the at least two light sources (2). 3) is provided, comprising the following steps: a) receiving an input signal (S _in) that specifies the light color to be emitted and / or the luminous flux to be emitted of the lighting system (1), b) calculating a clock cycle (T ) comprising a sequential sequence (Seq) of on-time ratios (V _R, V _B, V _G) of the at least two light sources (2), and possibly an additional operating pause time ratio (P) characterized by switching off all light sources, depending on the input signal (S _in), the sequential sequence being determined in such a way that at each point in time t only a maximum of one of the at least two light sources (2) is active, c) calculation of switch-on times (t _eR, t _eB, t _eG ) and, if applicable, an operating pause time (tp) by adding the on-time ratios (V _R, V _B, V _G) calculated in step b) and possibly the operational idle time ratio (P) can be multiplied by a variable reference time period (tref), and a variable cycle time period (t _T) is calculated by adding up the switch-on times (t <sub> eR </) provided within a cycle (T). sub>, t _eB, t _eG) and, if applicable, the operating break time (t _P), whereby all time ratios (V <sub> R </ sub>, V _B, V _G, P) and thus the time periods calculated from them (t _eR, t <sub> eB </ sub >, t _eG, tp) are selected in such a way that within the variable clock period (t _T) averaged over time d ie according to the input signal (S _in) specified light color and / or the luminous flux is emitted, d) control of the on and off processes of the at least two light sources (2) by means of the microcontroller (3) to implement the according to Step b) calculated sequential sequence (Seq) using the switch-on times calculated according to step c) (t _eR, t _eB, t _eG) and If necessary, the duration of the operating break (t _P).

Description

The invention relates to a method for variable-frequency control of the light color and / or the luminous flux (or the brightness) of a lighting system.

The invention further relates to a lighting control unit, comprising a storage medium on which a program logic for carrying out the method according to the invention is stored, and a microcontroller connected to the storage medium.

The invention also relates to a lighting module comprising a lighting system and a lighting control unit according to the invention.

The invention further relates to a lighting arrangement comprising a number of individually controllable lighting modules according to the invention.

From the prior art, lighting systems are known in which the control of the emitted light color and the brightness takes place via pulse width modulation, which is controlled by means of a microcontroller. For this purpose, the microcontroller has a timer and an associated comparator for each light source to be regulated, with each light source being activated for a certain period of time within a clock period. This period of time is recorded by comparing a predefinable timer setpoint with the actual timer value by means of the comparator, and the respective light source is controlled accordingly. The clock rate of such a microcontroller can be, for example, a frequency of 1 kHz, with sub-intervals that enable the combination of RGB color components to be present within such an interval. With a division into four sub-intervals (see Fig. 1 ) the individual light sources can be switched off with a frequency of up to 4kHz.

Since the minimum switch-on time is limited due to the minimum sub-interval of the timing of the microcontroller, it may be necessary, for example, to increase the cycle time to dim the emitted light in order to reduce the proportion of the minimum sub-interval in the total time. This also enables different ratios of the Achieve a mixture of the light colors involved. For example, the operating frequency of the microcontroller can be reduced to 500 Hz by halving it. Figure 2 shows such a transition in which a clock interval now comprises 8 minimum time sub-intervals. In this, for example, the proportion of the light color "red" in the emitted light distribution is to be reduced or dimmed (in the present case halved). The remaining light colors green and blue should, however, be retained unchanged. Since a light color can only be switched off once within the cycle interval, the switch-on duration of the emission of the light colors green and blue is simply doubled if the cycle duration is doubled. After the transition has taken place, an unchanged emission of the light colors green and blue is ensured on average over time. However, there is a brief increase in the average radiation in the transition area, which in Figure 2 is represented by the circled area. Only the following, now extended, switch-on pause or switch-off period leads to the decrease in the increase towards the originally targeted average value.

Depending on the clock rate of the microcontroller, this brief increase can be seen by the human eye. In addition, the rigid mode of operation of the microcontroller is associated with the problem that pulsations can arise in the radiation from lighting systems that are largely synchronized, which can be recognized by the human eye and have a disruptive effect.

1. a) Empfang eines die abzustrahlende Lichtfarbe und/oder den abzustrahlenden Lichtstrom des Beleuchtungssystems vorgebenden Inputsignals,
2. b) Berechnen eines Taktzyklus umfassend eine sequenzielle Abfolge von Einschaltzeitdauerverhältnissen der zumindest zwei Lichtquellen, und gegebenenfalls eines zusätzlichen durch Ausschaltung sämtlicher Lichtquellen gekennzeichneten Betriebspausenzeitverhältnisses, in Abhängigkeit von dem Inputsignal, wobei die sequenzielle Abfolge dergestalt bestimmt wird, dass zu jedem Zeitpunkt immer nur maximal eine der zumindest zwei Lichtquellen aktiv ist,
3. c) Berechnen von Einschaltzeitdauern und gegebenenfalls einer Betriebspausenzeitdauer, indem die in Schritt b) errechneten Einschaltzeitdauerverhältnisse und gegebenenfalls das Betriebspausenzeitdauerverhältnis mit einer variablen Referenzzeitdauer multipliziert werden, und berechnen einer variablen Taktzeitdauer durch Summation der innerhalb eines Taktzyklus vorgesehenen Einschaltzeitdauern und gegebenenfalls der Betriebspausenzeitdauer, wobei sämtliche Zeitdauerverhältnisse und damit die daraus berechneten Zeitdauern dergestalt gewählt sind, dass innerhalb der variablen Taktzeitdauer im zeitlichen Mittel die gemäß dem Inputsignal vorgegebene Lichtfarbe und/oder der Lichtstrom abgestrahlt wird,
4. d) Steuerung der Ein- und Ausschaltvorgänge der zumindest zwei Lichtquellen mittels dem Mikrocontroller zur Umsetzung der gemäß Schritt b) berechneten sequenziellen Abfolge unter Heranziehung der gemäß Schritt c) errechneten Einschaltzeitdauern und gegebenenfalls Betriebspausenzeitdauer.

One object of the invention is therefore to create a method with which the disadvantages of the prior art are overcome. This object is achieved with a method of the type mentioned in that, according to the invention, the lighting system comprises at least two light sources of different light colors, a microcontroller being provided for controlling the at least two light sources, comprising the following steps:

1. a) Receipt of an input signal specifying the light color to be emitted and / or the luminous flux of the lighting system to be emitted,
2. b) Calculation of a clock cycle comprising a sequential sequence of switch-on time ratios of the at least two light sources, and optionally an additional one characterized by switching off all light sources Operating pause time ratio, as a function of the input signal, the sequential sequence being determined in such a way that only a maximum of one of the at least two light sources is active at any point in time,
3. c) Calculating on-time durations and, if necessary, an operating pause time by multiplying the on-time ratios calculated in step b) and, if applicable, the operating pause time ratio by a variable reference time period, and calculating a variable cycle time by adding up the on-times provided within a clock cycle and, if applicable, the operating pause time, with all time ratios and so that the time periods calculated therefrom are selected in such a way that the light color and / or the light flux specified according to the input signal is emitted within the variable cycle time period on average,
4. d) Control of the switching on and off processes of the at least two light sources by means of the microcontroller to implement the sequential sequence calculated in accordance with step b) using the on-time durations calculated in accordance with step c) and, if necessary, the duration of the operating pause.

The method according to the invention makes it possible to vary the light color and the brightness of the light emitted by the lighting system without causing undesired transitional overlaps or without having to accept fluctuations in the light emission from different lighting systems. In addition, the microcontroller can be designed in a particularly simple manner, since only one light source is active at a time.

In other words, as an alternative to the usual control via three PWM signals (for an RGB system) with a fixed frequency, time spans of, for example, red, green, blue (other colors are also possible) and no light in any sequential order and with almost any Periods of time are output.

The sum of all time periods can preferably also be less than 10 ms in the dimmed state in order to stay above the flicker fusion frequency. Only the relationship between the time spans has to be strictly observed. This way you can use the same hardware can achieve much more precise resolutions and thus color settings.

In addition, since in the method according to the invention no states occur in which two colors are switched on at the same time, it is not necessary to design the power supply unit for a higher peak load. The "light off" time period can preferably also be divided into several time periods and inserted between the time periods of the individual colors. Since this method also requires only one counter, inexpensive microcontrollers can be used. As an alternative to colored light sources, white light sources or white light sources, in particular LEDs, can also be controlled with different color temperatures.

In particular, it can be provided that the microcontroller only uses a single comparator and / or a single timer to control the at least two light sources.

Furthermore, it can be provided that when calculating the sequential sequence according to step b) in the case of activation of at least two light sources within the clock interval of that light source that is active for the shortest time during the clock interval, the reference time period is assigned, the switch-on periods of the remaining light sources being Multiplication of the reference switch-on duration with an individual factor greater than 1 is established, with each factor being weighted according to the ratio of the calculated switch-on duration ratios. The shortest switch-on time is standardized to the value "1", so to speak, and the remaining switch-on times are given a factor greater than or equal to 1, the actual times being calculated by multiplying the respective factor with the reference time.

In particular, it can be provided that the microcontroller has a minimum switch-on time period that corresponds to a lowest time period that can lie between a switch-on and an immediately following switch-off process, the following applies to the reference time period: tref tmin. This minimum switch-on time is specified by the technical limitations of the microcontroller and can be taken from or derived from the technical data sheet of the microcontroller used.

In order to prevent beats, provision can be made for the reference time duration to be determined as a function of a random variable or to be set to a randomly selected new value and the other time periods to be adjusted in proportion. This not only prevents the lamps from oscillating with one another, but also achieves error-free dimming down to the 0.1% range by increasing the "light off" period and a continuous frequency change. The random value can be determined, for example, with the aid of a noise generator.

Furthermore, it can be provided that the reference time period is selected such that the resulting cycle time period t _{T is} a maximum of 10 ms. In this way, it can be ensured that the human eye does not perceive the individual switch-on periods and periods of break in operation per se, but only records the time average of the sequence of these periods of time. In this way, the clock frequency remains above the flicker fusion frequency.

In particular, it can be provided that the lighting system for the optical transmission of information is controlled by manipulating the sequential sequence to be calculated in step b), taking into account an information signal to be transmitted, the information signal being manipulated by targeted selection of the temporal sequence of the resulting according to step c) Switch-on times and possibly periods of break in operation is coded into the light distribution emitted by the lighting system.

Furthermore, it can be provided that an optical sensor is provided for detecting an information signal, in that the sensor is set up to detect the coded light distribution emitted by an illumination system. The coding can be implemented, for example, by specifically defining the sequence in which the radiation is emitted by the individual light sources and by specifically arranging pauses within a clock cycle. In this way, the degrees of freedom that are given by the present method according to the invention in the emission of the light distribution can be used in a targeted manner without influencing the emitted light distribution in the mean value and without the coding affecting in a manner visible to the human eye Light distribution affects.

In particular, it can be provided that the lighting system has at least three light sources, namely a light source for radiating red light, a light source for radiating green light, and a light source for radiating blue light. By superimposing the radiation from these light sources, the emitted light color can be manipulated in a simple manner, including the emission of white light.

The invention further relates to a lighting control unit, comprising a storage medium on which a program logic for carrying out the method according to the invention is stored, and a microcontroller which is connected to the storage medium and is set up to receive the input signal and the light color to be emitted and / or Specify the lighting intensity of the lighting system using the program logic according to the method according to the invention.

The invention also relates to a lighting module comprising a lighting system and a lighting control unit according to the invention for controlling the lighting system, the lighting system comprising at least two light sources of different light colors.

In particular, it can be provided that the at least two light sources are LED light sources.

The invention further relates to a lighting arrangement comprising a number of individually controllable lighting modules according to the invention. These lighting modules can in particular be set up to communicate with one another. In addition, the already mentioned features can avoid pulsations and undesired overlapping between the light distributions emitted by the lighting modules.

• Figur 1 eine schematische Darstellung der Steuerung eines Beleuchtungssystems gemäß dem Stand der Technik,
• Figur 2 einen dimmregelungsbedingten Übergang hin zu einer reduzierten Arbeitsfrequenz und eine daraus resultierende kurzfristige erkennbare Veränderung der Intensität der der Lichtverteilung gemäß der Steuerung nach Fig. 1,
• Figur 3 eine schematische Darstellung der Steuerung mittels des erfindungsgemäßen Verfahrens,
• Figur 4 eine schematische Darstellung eines erfindungsgemäßen Verfahrens sowie von zugehörigen Komponenten, und
• Figur 5 eine beispielhafte Darstellung der Arbeitsweise der Erfindung in Form eines Ablaufdiagrammes.

The invention is explained in more detail below with the aid of exemplary and non-restrictive embodiments which are illustrated in the figures. In it shows

• Figure 1 a schematic representation of the control of a lighting system according to the prior art,
• Figure 2 a dimming control-related transition to a reduced working frequency and a resulting short-term recognizable change in the intensity of the light distribution according to the control Fig. 1 ,
• Figure 3 a schematic representation of the control by means of the method according to the invention,
• Figure 4 a schematic representation of a method according to the invention and associated components, and
• Figure 5 an exemplary illustration of the mode of operation of the invention in the form of a flow chart.

In the following figures, unless otherwise stated, the same reference symbols denote the same features.

As already mentioned in the introduction to the description, show Figures 1 and 2 the known prior art, in which the individual light sources are controlled separately by means of PWM modulation, in the case of a dimming process it is necessary to greatly reduce the clock rate of the light control and the transition problems mentioned above can occur when the clock rates change. The horizontal axes are in the Figures 1 and 2 the timelines. Two images are superimposed in the vertical direction in the two figures - namely above the counting process assigned to the individual time periods, within which a timer reaches a predetermined value and when this value is determined by means of a comparator, and below the actual emission of light by a light source in each case , where the light sources R, G and B denote the light colors red, green and blue, respectively. The hatched areas denote the switched-on state of the light sources.

1. a) Empfang eines eine die abzustrahlende Lichtfarbe und/oder den abzustrahlenden Lichtstrom des Beleuchtungssystems 1 vorgebenden Inputsignals S_in,
2. b) Berechnen eines Taktzyklus T umfassend eine sequenzielle Abfolge Seq von Einschaltzeitdauerverhältnissen V_R, V_B, V_G der zumindest zwei Lichtquellen 2, und gegebenenfalls eines zusätzlichen durch Ausschaltung sämtlicher Lichtquellen gekennzeichneten Betriebspausenzeitverhältnisses P, in Abhängigkeit von dem Inputsignal S_in, wobei die sequenzielle Abfolge dergestalt bestimmt wird, dass zu jedem Zeitpunkt immer nur maximal eine der zumindest zwei Lichtquellen 2 aktiv ist,
3. c) Berechnen von Einschaltzeitdauern t_eR, t_eB, t_eG und gegebenenfalls einer Betriebspausenzeitdauer tp, indem die in Schritt b errechneten Einschaltzeitdauerverhältnisse V_R, V_B, V_G und gegebenenfalls das Betriebspausenzeitdauerverhältnis P mit einer variablen Referenzzeitdauer t_ref multipliziert werden, und Berechnen einer variablen Taktzeitdauer t_T durch Summation der innerhalb eines Taktzyklus vorgesehenen Einschaltzeitdauern t_eR, t_eB, t_eG und gegebenenfalls der Betriebspausenzeitdauer t_P, wobei sämtliche Zeitdauerverhältnisse V_R, V_B, V_G, P und damit die daraus berechneten Zeitdauern t_eR, t_eB, t_eG, tp dergestalt gewählt sind, dass innerhalb der variablen Taktzeitdauer t_T im zeitlichen Mittel die gemäß dem Inputsignal S_in vorgegebene Lichtfarbe und/oder der Lichtstrom abgestrahlt wird,
4. d) Steuerung der Ein- und Ausschaltvorgänge der zumindest zwei Lichtquellen 2 mittels dem Mikrocontroller 3 zur Umsetzung der gemäß Schritt b berechneten sequenziellen Abfolge Seq unter Heranziehung der gemäß Schritt c errechneten Einschaltzeitdauern t_eR, t_eB, t_eG und gegebenenfalls Betriebspausenzeitdauer t_P.

Figure 3 shows a schematic representation of the control by means of the method according to the invention. In contrast to the prior art, according to the invention there is always only a maximum of one of the light sources 2 (see FIG Fig. 4 ) active, which are designated as R, G and B here. More precisely, is in it in synopsis Figure 4 a method for variable-frequency control of the light color and / or the luminous flux of a lighting system 1 is shown, the lighting system 1 comprising at least two light sources 2 of different light colors, wherein a microcontroller 3 is provided for controlling the at least two light sources 2, comprising the following steps:

1. a) reception of an input signal S _in that specifies the light color to be emitted and / or the luminous flux to be emitted of the lighting system 1,
2. b) Calculating a clock cycle T comprising a sequential sequence Seq of switch-on time ratios V _R , V _B , V _{G of} the at least two light sources 2, and optionally an additional operating pause time ratio P, characterized by switching off all light sources, depending on the input signal S _in , the sequential The sequence is determined in such a way that at any point in time only a maximum of one of the at least two light sources 2 is active,
3. c) Calculating on-time _durations t _eR , t _eB , t _eG and, if applicable, an operating pause time tp by multiplying the on-time ratios V _R , V _B , V _G calculated in step b and, if applicable, the operating _{pause time} ratio P by a variable reference time period t _ref , and calculating a variable cycle time t _T by adding up the switch-on times t _eR , t _eB , t _eG provided within a cycle and, if applicable, the operating break time t _P , with all time ratios V _R , V _B , V _G , P and thus the time periods t _eR , calculated therefrom. t _eB , t _eG , tp are selected such that the light color and / or the luminous flux specified _in accordance with the input signal S _{in is} emitted within the variable cycle time t _T ,
4. d) Control of the switching on and off processes of the at least two light sources 2 by means of the microcontroller 3 to implement the sequential sequence Seq calculated in accordance with step b, using the on-time _durations t _eR , t _eB , t _eG calculated in accordance with step c and, if applicable, the operating pause time t _P.

In the example according to Figure 3 it can be seen that within the first cycle time T _T1 the color green is emitted twice as long as the color red and the color blue is emitted three times as long as the color red. The color red thus has the shortest on-time. If the emission duration for the color red is normalized to the value "1", the value for the duration of the color green is therefore "2" and for the color blue it is consequently "3". The pause is given the value "2". The time ratios are therefore as follows: V _R = 1, V _G = 2, V _B = 3, P = 2. If these ratios are now multiplied by the reference time period t _ref, for example by 1 μs, the following time periods result: t _eR = 1 µs, t _eG = 2 µs, t _eB = 3 µs, t _P = 2 µs. This results in a cycle duration T _T1 = 8 microseconds. The relationships themselves can be derived from the input signal Sin, taking into account the power of the light sources. Assuming that the light sources R, G and B all emit light with the same power during the switch-on period, this would mean that the light components of R, G and B simply correspond to the temporal relationships to one another on average over time.

Should now - similar to in Figure 2 in the prior art - in a subsequent clock period, the portion of the red light R is reduced, this can be done in a simple manner, as based on the second clock period T _T2 Figure 3 is shown. Starting from the first clock period T _T1 , the red light component can be dimmed by simply increasing the green and blue switch-on times. In addition, the duration of the pause can also be increased so that the emission of the green and blue light remains unchanged over time. That is, the switch-on time for the red light can remain unchanged V _R = 1, and the remaining time periods can be increased, for example, by 10%, which results in: V _G = 2.2, V _B = 3.3, P = 2.2 and t _eR = 1 µs, t _eG = 2.2 µs, t _eB = 3.3 µs, t _P = 2.2 µs and T _T2 = 8.7 µs. In this way, an extremely robust and finely adjustable brightness and color control can be made. This temporal extension of the switch-on periods within the second cycle period T _T2 is shown in FIG Figure 3 clearly recognizable by comparison with the auxiliary lines L1, L2 and L3.

In particular, it can be provided that when calculating the sequential sequence Seq according to step b), in the case of activation of at least two light sources 2 within the clock interval of that light source 2 which is active for the shortest time during the clock interval, the reference time duration t _{ref is} assigned, the Switch-on periods of the remaining light sources by multiplying the reference switch-on period t _ref by an individual one Factor greater than 1 is set, each factor being weighted according to the ratio of the calculated switch-on time ratios V _R , V _B , V _G.

Furthermore, that the illumination system 1 is driven for optical transmission of information can be provided by taking into account an information to be transmitted signal S _I in step) b to be calculated sequential sequence Seq is manipulated, wherein the information signal S _I through targeted selection of the temporal sequence of the according to step c) resulting on-time _durations t _eR , t _eB , t _eG and, if applicable, operational _{idle durations} t _{P are} encoded into the light distribution emitted by the lighting system 1.

Figure 5 shows an exemplary illustration of the mode of operation of the invention in the form of a flow chart. In the following, the invention is described in very general terms, in other words with a view to the diagram according to FIG Figure 5 described:

The invention relates to a method or a method for controlling multicolored LEDs with 2 to n colors or color temperatures, wherein the brightness can be viewed as an additional color. It concerns an optimized color control in order to achieve maximum resolution of brightness and color with an optimal light fusion frequency and the best possible temporal load distribution for the required power supply. With the condition that the individual output currents of the color LEDs never overlap, it is guaranteed that currents higher than the rated current will never be drawn from the power supply unit. The control takes place by sequential output of the channels, for example: the three colors R, G, B and H (brightness). In the first block it is determined which channels are involved in the desired mixing ratio and which of these channels has the smallest share in it. In the second block, the smallest portion is assigned the optimal pulse output time (preferably in the range 1-10us). Based on this, the necessary output times for the other channels are calculated. In the third block, the channel with the longest output time is determined. If this is greater than the maximum output time (preferably 0.5-1ms), it is divided into two parts and nested with the other channels.

This process is repeated until all output times of the channels meet this requirement (<optimal light fusion frequency) or the divided output times reach the minimum pulse duration.

In order to avoid fluctuations between the lamps, random times can be added in the fourth block. Finally, in block 5, as an optimization, the output frequencies that occur can be reduced in order to reduce the switching losses.

With this method, all available degrees of freedom can be optimally used to achieve the best possible light conditions for the human eye. Since different output patterns lead to the same lighting conditions, it can optionally be provided that information is transmitted through the sequential output of different output patterns without disturbing the lighting conditions.

In view of this teaching, the person skilled in the art is able to arrive at other embodiments of the invention, not shown, without inventive activity. The invention is therefore not restricted to the embodiments shown. Individual aspects of the invention or the embodiments can also be taken up and combined with one another. Any reference signs in the claims are exemplary and only serve to make the claims easier to read without restricting them.

Claims (13)

Method for variable-frequency control of the light color and / or the luminous flux of a lighting system (1), the lighting system (1) comprising at least two light sources (2) of different light colors, a microcontroller (3) being provided for controlling the at least two light sources (2) , comprising the following steps: a) Receipt of an input signal (S _in ) that specifies the light color to be emitted and / or the luminous flux of the lighting system (1) to be emitted, b) calculating a clock cycle (T) comprising a sequential sequence (Seq) of on-time ratios (V _R , V _B , V _G ) of the at least two light sources (2), and optionally an additional operating pause time ratio (P) characterized by switching off all light sources, in Dependence on the input signal (S _in ), the sequential sequence being determined in such a way that only a maximum of one of the at least two light sources (2) is active at any point in time, c) Calculating on-time durations (t _eR , t _eB , t _eG ) and, if applicable, an operating pause time (tp) by combining the on-time ratios (V _R , V _B , V _G ) calculated in step b) and, if applicable, the operating _{pause time ratio} (P) with a variable reference time period (tref) are multiplied, and calculation of a variable cycle time period (t _T ) by adding up the switch-on times (t _eR , t _eB , t _eG ) provided within a clock cycle (T) and, if applicable, the operating pause time (t _P ), all time ratios (V _R , V _B , V _G , P) and thus the time periods calculated therefrom (t _eR , t _eB , t _eG , t _P ) are selected in such a way that, within the variable cycle time period (t _T ), the time average according to the Input signal (S _in ) given light color and / or the luminous flux is emitted, d) Control of the switching on and off processes of the at least two light sources (2) by means of the microcontroller (3) to implement the sequential sequence (Seq) calculated in accordance with step b) using the on-time durations (t _eR , t _eB ) calculated in accordance with step c), t _eG ) and, if applicable, the duration of the break in operation (t _P ). Method according to claim 1, wherein the microcontroller (3) uses only a single comparator and a single timer to control the at least two light sources (2). The method according to claim 1 or 2, wherein when calculating the sequential sequence (Seq) according to step b) in the case of activation of at least two light sources (2) within the clock interval of that light source (2) which is active during the clock interval the shortest Reference time duration (t _ref ) is assigned, the switch-on times of the remaining light sources being determined by multiplying the reference switch-on time (t _ref ) by an individual factor greater than 1, each factor corresponding to the ratio of the calculated switch-on time ratios (V _R , V _B , V _G ) is weighted. Method according to claim 3, wherein the microcontroller has a minimum switch-on time period (t _min ) which corresponds to a lowest time period that can lie between a switch-on and an immediately following switch-off process, the following applies to the reference time period (t _ref ): t _ref ≥ t _min . Method according to Claim 4, the reference time duration (t _ref ) being determined as a function of a random variable. Method according to one of the preceding claims, wherein the reference time period (t _ref ) is selected such that the resulting cycle time period (t _T ) is a maximum of 10 ms. Method according to one of the preceding claims, wherein the lighting system (1) for the optical transmission of information is controlled by manipulating the sequential sequence (Seq) to be calculated in step b) taking into account an information signal (S _I ) to be transmitted, the information signal being manipulated (S _I ) is coded into the light distribution emitted by the lighting system (1) through targeted selection of the chronological sequence of the switch-on times (t _eR , t _eB , t _eG ) resulting from step c) and, if applicable, operating _{pause times} (t _P ). Method according to claim 7, wherein an optical sensor (4) is provided for detecting an information signal, in that the sensor (4) is set up to detect the coded light distribution emitted by an illumination system (1). Method according to one of the preceding claims, wherein the lighting system (1) has at least three light sources (2), namely a light source for radiating red light, a light source for radiating green light, and a light source for radiating blue light. Lighting control unit, comprising a storage medium on which a program logic for performing the method according to one of the preceding claims is stored, and a microcontroller (3) connected to the storage medium, which is set up to receive the input signal (S _in ), and to specify the light color to be emitted and / or the illumination intensity of the lighting system (1) using the program logic according to the method according to one of the preceding claims. Lighting module, comprising a lighting system (1) and a lighting control unit (1) according to claim 10 for controlling the lighting system (1), wherein the lighting system (1) comprises at least two light sources (2) of different light colors. Lighting module according to claim 11, wherein the at least two light sources (2) are LED light sources. Lighting arrangement comprising a number of individually controllable lighting modules according to claim 11 or 12.

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