JP2001052883A - High-pressure sodium lamp lighting device and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-pressure sodium lamp lighting device capable of using a small-sized, lightweight, and low-cost ballast for lighting and capable of reducing the price of a lighting system, and to provide a lighting system using the same. SOLUTION: A high-pressure sodium lamp HPS equipped with an ionized medium, substantially not including mercury but including sodium and xenon as light-emitting metal and sealed in a light-transmitting ceramic discharge container CE, and having a lamp voltage of 35-70 V and a rated consumption power of 100 W or less, is lighted by a lagging-type ballast BR connected to an alternating-current power supply AS having a supply voltage 90-120 V. By adapting the inner diameter of the light-transmitting ceramic discharge container CE to be <=6 mm and the distance between electrodes to be <=30 mm, the lamp voltage can be caused to fall within the range of values while xenon can be sealed in at a pressure of 100 to 250 Torr, and therefore the efficiency of the lamp can be enhanced. The lagging-type ballast BR can be mainly composed of a single choke coil SC.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-pressure sodium lamp lighting device using a high-pressure sodium lamp substantially free of mercury and a lighting device using the same.

[0002]

2. Description of the Related Art A high-pressure sodium lamp which is frequently used at present contains not only sodium but also mercury as a buffer gas in the form of sodium amalgam. in this case,
Mercury acts to increase the input to the arc and increase the sodium vapor pressure. Therefore, the discharge in the positive column is
It is essentially a sodium discharge.

[0003] However, since mercury has a large environmental load,
I don't want to use it if possible. From such a viewpoint, a high-pressure sodium lamp in which mercury is not sealed has been studied.

[0004]

However, in a high-pressure sodium lamp in which mercury is not sealed, the Na vapor pressure increases in order to increase the electric field of the discharge, and therefore the efficiency decreases due to self-absorption. In order to cope with the decrease in efficiency due to self-absorption, the light-transmitting ceramic discharge vessel may be elongated, but this increases the starting voltage.

[0005] The sealing pressure of xenon is set to 200 torr.
It is known that high efficiency can be obtained if it is increased to a certain extent, but this further increases the starting voltage, so that this measure cannot be adopted.

Since the conventional high-pressure sodium lamp which does not contain mercury has a lamp voltage of 75 to 110 V, it is necessary to light it using a special slow-type ballast having a secondary open voltage of about 200 to 240 V. was there. Also, 10
A low-power lamp of 0 W or less is often lit using a 100V-class power supply. In that case, a ballast having a boosting function must be used. Heavy and expensive.

An object of the present invention is to provide a high-pressure sodium lamp lighting device which can be lighted by a small, lightweight, and inexpensive ballast and can reduce the price as an illumination system, and a lighting device using the same.

[0008]

According to a first aspect of the present invention, there is provided a lighting device for a high-pressure sodium lamp, comprising: a transparent ceramic discharge vessel; a pair of electrodes sealed at both ends of the transparent ceramic discharge vessel; And a translucent ceramics encapsulation containing xenon and an ionizing medium substantially free of mercury.
A high-pressure sodium lamp having a rated power consumption of 100 W or less and a power supply voltage of 90 to 120 V
And a slow-type ballast interposed between the AC power supply and the high-pressure sodium lamp.

In the present invention and the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.

<Regarding the high-pressure sodium lamp> The high-pressure sodium lamp performs a tube wall stable discharge at a saturated vapor pressure of sodium, so-called D-line of sodium causes self-absorption, and causes a long-wavelength side and a short-wavelength side of a visible portion. This is a high-intensity discharge lamp that generates a light color called warm white due to broadening.

(Transparent ceramic discharge vessel)
"Translucent ceramics discharge vessel" refers to a single crystal metal oxide such as sapphire and a polycrystalline metal oxide such as a translucent hermetic aluminum oxide or yttrium.
Discharge made of aluminum-garnet (YAG), yttrium oxide (YOX), and light-transmitting, airtight, sodium-resistant and heat-resistant materials such as polycrystalline non-oxides such as aluminum nitride (AlN) Means a container. The “light transmissivity” means that the light emitted by the discharge is transmitted to the extent that the light can be transmitted to the outside through the discharge vessel, and may be either transparency or light diffusion.

The light-transmitting ceramic discharge vessel can be formed, for example, by sealing caps made of light-transmitting ceramic or sodium-resistant metal such as niobium at both ends of a tube of light-transmitting ceramic.

Further, it is permissible that an exhaust pipe made of a sodium-resistant metal such as niobium is sealed in the cap portion in order to evacuate the inside of the translucent ceramics discharge vessel and enclose the ionized medium.

(Regarding a pair of electrodes) A pair of electrodes are sealed at both ends of a translucent ceramic discharge vessel.

Further, the electrode can be fixed, for example, to a portion of the exhaust pipe protruding into the translucent ceramic discharge vessel by welding or caulking.

The ionizing medium is sodium and xenon and is substantially free of mercury.

[0017] Sodium is sealed in such a way that an excess portion of the sodium stays in the coldest part in the liquid phase during lighting.

Xenon is sealed at such a pressure that the lamp efficiency is as high as possible within a range where the starting voltage is allowable. However, in the present invention, the lamp voltage is 35 to 7
Since the voltage is reduced to 0 V, the starting voltage is reduced accordingly, so that the pressure can be set to increase the lamp efficiency.

In the present invention, "substantially free of mercury" means not only containing no mercury at all but also a light-transmissive ceramic discharge to such an extent that the action as a buffer gas does not affect the lamp operation. Container inner volume 1c
It is acceptable to contain less than 0.3 mg, more preferably less than 0.2 mg, of mercury per c.

(Lamp Voltage) The lamp voltage is 3
It is adjusted to be 5 to 70V. To this end, it is effective to reduce the distance between the electrodes.

(Rated Power Consumption) The rated power consumption is set to 100 W or less. For example, a high-pressure sodium lamp with a rated power consumption of 40 W or 50 W, 70 W or 75 W and 100 W can be lined up. These high-pressure sodium lamps can be used for security lights and garden lights for outdoor lighting, and spotlights and downlights for shop lighting mainly for indoor lighting.

(Other Configurations) (1) Outer tube The high-pressure sodium lamp uses niobium for the exhaust pipe and cap of the translucent ceramics discharge vessel, and niobium is a metal that is easily oxidized. In general, the optical ceramic discharge vessel is housed in an outer tube in which the inside is evacuated to a vacuum and the inside is filled with a vacuum or an inert gas.

(2) Starter If a starter is required to start the high-pressure sodium lamp, the starter may be incorporated in the high-pressure sodium lamp or in the ballast. Further, if necessary, only the starter may be provided independently of the high-pressure sodium lamp and the ballast.

When the starter is incorporated in a high-pressure sodium lamp, the starter is mainly composed of a thermally responsive switch, and is configured to generate a starting pulse voltage in cooperation with a ballast or to generate a pulse voltage. Then, a configuration in which the pulse voltage is boosted by using the ballast as a transformer to generate a starting pulse voltage can be adopted.

The thermally responsive switch can be obtained as a contact switch or a non-contact switch such as a non-linear capacitor.

In the case of a starter built in the ballast or provided separately from the ballast and the high-pressure sodium lamp,
Generally, the starter alone is configured to generate a pulse voltage.

(3) Proximity conductor A proximity conductor can be provided as needed to facilitate starting of the arc tube.

The proximity conductor can be provided by winding an elongated metal wire having the same potential as one of the electrodes on the outer surface of the translucent ceramics discharge vessel and extending to a position substantially facing the other electrode. . However, if necessary, the support frame of the arc tube extending along the arc tube can act as a proximity conductor.

<About Ballast> The ballast is a slow-type ballast that is connected to an AC power supply having a power supply voltage of 90 to 120 V, for example, a 100 V commercial AC power supply. A high-pressure sodium lamp that is turned on using this ballast has a lamp voltage of 35 to 70 V, and therefore does not need to be internally boosted.

Therefore, the ballast used in the present invention can have a simple structure without a boosting function.

<Function of the Present Invention> The present invention does not substantially enclose mercury as a buffer gas,
When the rated power consumption is 100 W or less and the lamp voltage is 3
The power supply voltage of 90 to 120 V
The high-pressure sodium lamp can be turned on without increasing the pressure using the AC power supply.

As a result, the lighting can be performed with a small, lightweight, and inexpensive ballast, and the cost of the lighting system can be reduced.

In addition, since the lamp voltage of the high-pressure sodium lamp is lowered even though mercury is not substantially sealed, the lamp pressure of xenon can be increased and high lamp efficiency can be obtained.

Further, the high-pressure sodium lamp used in the present invention has a somewhat more green component in the emission spectrum distribution as compared with the high-pressure sodium lamp filled with mercury as a buffer gas. Therefore, when a high-pressure sodium lamp used in the present invention illuminates an illuminated object having vegetation, bright illumination can be performed.

On the other hand, a conventional high-pressure sodium lamp containing mercury has a somewhat pinkish light color, which is not necessarily suitable for lighting plants and trees.

Therefore, when the present invention is applied to a security light, it is extremely effective in terms of the lighting effect and also in that the high-pressure sodium lamp does not contain mercury, so that its disposal is easy.

According to a second aspect of the present invention, there is provided the high pressure sodium lamp lighting device according to the first aspect, wherein the high pressure sodium lamp has an inner diameter of a transparent ceramic discharge vessel of 6 mm or less and a distance between electrodes. Is 30 mm or less, and an outer tube in which a vacuum or an inert gas is sealed.

The present invention specifies a structure suitable for setting the lamp voltage of the high-pressure sodium lamp to 35 to 70 V.

When the inner diameter of the transparent ceramics discharge vessel is 6 mm or less, the tube wall load can be set to a required level and the sodium vapor pressure can be maintained at a predetermined level.

Further, if the distance between the electrodes exceeds 30 mm, it becomes difficult to reduce the lamp voltage to 70 or less, and the starting voltage becomes too high. Therefore, it is difficult to increase the sealing pressure of xenon to increase the lamp efficiency. Become.

When the tube wall load exceeds 20 W / cm ² , it is desirable to fill the outer tube with an inert gas such as nitrogen in order to prevent the arc tube from overheating. Tube wall load is 20
When it does not exceed W / cm ² , the inside of the outer tube can be evacuated.

According to a third aspect of the present invention, there is provided the high pressure sodium lamp lighting device according to the first or second aspect, wherein xenon is sealed at a pressure of 100 to 250 torr.

According to the present invention, by setting the lamp voltage to 35 to 70 V, the sealed pressure of xenon can be increased to the above-mentioned range, and a high lamp efficiency can be obtained within this sealed pressure range.

However, the higher the enclosed pressure of xenon is, the higher the lamp efficiency is. However, if the pressure exceeds 250 torr, the starting voltage exceeds 5 kV, and lighting becomes difficult.

According to a fourth aspect of the present invention, there is provided a lighting device for a high-pressure sodium lamp according to any one of the first to third aspects, wherein the slow-type ballast is mainly composed of a single choke coil. It is characterized by:

The present invention specifies the simplest, compact, lightweight, and inexpensive configuration of a slow-type ballast having no boost function.

Thus, according to the present invention, it is possible to reduce the weight of the late type ballast to 2 kg or less.

When the ballast has a built-in starter, the output end of the pulse voltage generator is applied to a part of the windings of the single choke coil to convert the single choke coil into a single-turn transformer with respect to the pulse voltage. It is also possible to obtain a required value of the starting pulse voltage by performing a boosting action as a heater. However, the pulse voltage generator may be simply connected between the ballast output terminals.

A lighting device according to a fifth aspect of the present invention includes a lighting device main body; and a high-pressure discharge lamp lighting device according to any one of claims 1 to 4, wherein at least a high-pressure sodium lamp is mounted on the lighting device main body. It is characterized by doing.

“Illumination device” means a device configured to use the light emission of a high-pressure sodium lamp for any purpose. Therefore, it is widely applied to various uses such as lighting.

For lighting, it is applicable to various indoor and outdoor lighting fixtures. Particularly, it is suitable for security lights, spotlights for store lighting, downlights, and the like.

In the present invention, the expression "at least the high-pressure sodium lamp is mounted on the lighting device" means not only a configuration in which the high-pressure sodium lamp and the ballast are mounted on the lighting device main body, but also that the ballast is a lighting device. This means that the configuration may be such that the device is disposed at a place separated from the apparatus main body.

For a high-pressure sodium lamp,
Since the ballast is larger than the size of the lamp, it is necessary to install the ballast at a remote position as necessary to avoid size increase of the lighting device and for design reasons. is there. In the present invention, the ballast is relatively small and light, but still large relative to the size of the high pressure sodium lamp.

Since the high-pressure sodium lamp used in the present invention does not substantially contain mercury, it is easy to dispose of the high-pressure sodium lamp whose life has expired.

[0055]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing a first embodiment of the high pressure sodium lamp lighting device of the present invention.

FIG. 2 is a front view showing the same high-pressure sodium lamp.

FIG. 3 is an enlarged sectional view showing the arc tube of the high-pressure sodium lamp.

In each figure, AS is an AC power supply, HPS is a high-pressure sodium lamp, and BR is a ballast.

<About AC power supply AS> AC power supply AS
Is a 100 V commercial AC power supply.

<Regarding the high-pressure sodium lamp> The high-pressure sodium lamp HPS includes an arc tube IB, an outer tube OB, a support frame conductor SF, connection bands CB1, CB2, and a proximity conductor SA.
And a base B.

The arc tube IB includes a translucent ceramic discharge vessel CE, an exhaust pipe ET, and a pair of electrodes E.
An ionization medium is sealed in the inside.

The translucent ceramic discharge vessel CE is shown in FIG.
As shown in the figure, a pair of end caps EC made of a pair of translucent alumina ceramics are sealed to both ends of a tube CT having an inner diameter of 4 mm made of translucent alumina ceramics with a ceramic sealing compound seal. To form an airtight container.

The exhaust pipe ET is made of niobium, is inserted into the center of the end cap EC so that the tip protrudes into the translucent ceramics discharge vessel CE, and is hermetically attached by a ceramic sealing compound seal. I have. An exhaust port E is provided on a side surface near the end of the exhaust pipe ET.
Ta is formed.

The pair of electrodes E includes an electrode shaft Ea made of tungsten and a coil Eb made of tungsten.

The base end of the electrode shaft Ea is fixed to the front end of the exhaust pipe ET by caulking.

The coil Eb is mounted on the tip of the electrode shaft Ea.

The distance between the electrodes is set to 18 mm.

The ionizing medium is about 2 mg of sodium and xenon with a filling pressure of 200 torr.

Thus, the arc tube IB has a lamp voltage of 5
It is set to 0V.

The outer tube OB is formed by sealing a flare stem HS at the open end of a T-shaped bulb TB, and has an arc tube IB inside.
And nitrogen gas is sealed inside.

The arc tube IB is fixed to a predetermined position in the outer tube OB via a support frame SF and connection bands CB1 and CB2 to a pair of introduction lines LW1 and LW2 which airtightly penetrate the flare stem HS.

The support frame SF is supported in the outer tube OB by welding one end to the introduction line LW1 and elastically contacting the other end with the inner surface of the distal end of the outer tube OB. And it constitutes the main part of the conductor connected to one electrode E of the arc tube IB.

The connection band CB1 mechanically supports the upper portion of the arc tube IB by fixing the upper exhaust tube ET of the arc tube IB in FIG.
The support frame SF and the exhaust pipe ET are electrically connected.

The connection band CB2 mechanically supports the lower portion of the arc tube I by connecting the introduction line LW2 and the exhaust tube ET below the arc tube IB in FIG. 2, and electrically connects the two. Connected to

One end of the proximity conductor SA has a connection band CB1.
The middle part extends close to the outer periphery of the translucent ceramics discharge vessel CE, and the other end reaches a position almost facing the lower electrode in FIG.

The base B is made of an E26 type screw base, is mounted on the outer tube OB, and is connected to the introduction lines LW1 and LW2.

<About Ballast BR> The ballast BR includes a single choke coil SC, a pulse voltage generator PG, and a power factor improving circuit PFI.

The single choke coil SC is connected in series with the high-pressure sodium lamp HNL, is connected between both poles of the AC power supply AS, and acts as a current limiting impedance.

The input terminal of the pulse voltage generator PG is connected to the AC power supply AS via the single choke coil SC, and the pulse voltage generator PG is connected so that the pulse voltage output is superimposed on the output of the single choke coil SC.

The power factor improving circuit PFI comprises a capacitor C connected between both poles of the AC power supply AS and a resistor R connected in parallel with the capacitor C. Note that the resistor R discharges residual charges to perform an electric shock prevention action.

Thus, the ballast BR having the above configuration
Has a weight of 1.5 kg.

<Circuit Operation> When the AC power supply AS is turned on, an AC voltage of 100 V is applied between the pair of electrodes E of the arc tube IB of the high-pressure sodium lamp HNL via the single choke coil SC of the ballast BR.

At the same time, since an AC voltage is applied to the input terminal of the pulse voltage generator PG, a pulse voltage is generated and superimposed on the output terminal of the single choke coil SC.

In the high-pressure sodium lamp HNL, when a high-voltage starting pulse voltage is applied between the proximity conductor SA and the lower electrode, the xenon in the arc tube IB is broken down to start discharging, and the starting is started. I do. When xenon discharge starts, sodium evaporates due to the heat generated at that time, sodium vapor discharge occurs, the rate of sodium vapor discharge increases with time, and eventually the so-called golden white continuous spectrum Light emission is obtained.

On the other hand, the pulse voltage generator PG is configured such that when the high pressure sodium lamp HPS is turned on, the pulse voltage generation stops.

The lamp efficiency at a power consumption of 70 W of the high-pressure sodium lamp HPS was 100 lm / W.

On the other hand, the high pressure sodium lamp containing no mercury in the prior art has a lamp voltage of 90 V,
The limit was xenon filling pressure up to 100 torr.
Further, the ballast required a boosting function in the case of a 100 V AC power supply, and accordingly, the weight became 3 to 5 kg.

Further, as a result of lighting the high-pressure sodium lamp in the prior art using the above-mentioned ballast, the lamp power
At 0 W, the lamp efficiency was 90 lm / W.

FIG. 4 is a circuit diagram showing a second embodiment of the high pressure sodium lamp lighting device according to the present invention.

In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment relates to a high-pressure sodium lamp NP
The difference is that the starter ST is built in S.

That is, the starter ST is composed of a series circuit of a lighting tube GS and a bimetal normally closed switch BS, is connected in parallel with the arc tube IB, and the bimetal normally closed switch BS removes heat of the arc tube IB. At the receiving position, it is arranged in the outer tube OB.

On the other hand, the ballast BR includes a single choke coil SC and a power factor improvement circuit PFI.

When the AC power supply AS is turned on, the arc tube IB and the starter S of the high-pressure sodium lamp HPS are turned on.
An AC voltage is applied to T via the ballast BR.

As a result, the ignition tube GS of the starter ST starts glow discharge, and the built-in bimetallic contact is displaced by the heat generated at that time, and eventually comes into contact with the fixed contact.
At this time, a current flows from the AC power supply AS to the starter ST through the ballast BR, and electromagnetic energy is accumulated in the ballast BR. When the ignition tube GS is closed, heat generation stops,
The lighting tube G starts cooling, and the bimetal contact is rapidly opened again soon. At this time, the electromagnetic energy accumulated in the ballast BR is released, a pulse voltage is generated from the ballast BR, and applied to the high-pressure sodium lamp,
It starts and lights up in the same way as in FIG.

When the high-pressure sodium lamp HPS is turned on, the arc tube IB is heated to a high temperature due to discharge, and the bimetal normally-closed switch BS is opened, so that the starting circuit ST during lighting stops operating.

FIG. 5 is a central cross-sectional bottom view showing a security light as an embodiment of the lighting device of the present invention.

In the figure, 1 is a high-pressure sodium lamp,
2 is a security light body.

The high-pressure sodium lamp 1 has the same specifications as those shown in FIG.

The security light body 2 includes a base 2a, a reflector 2b,
It comprises a lamp socket 2c, a ballast 2d, an opening / closing frame 2e, a translucent glove 2f, and the like.

The base 2a has an inverted boat bottom shape, is provided with a light projecting opening 2a1 on the lower surface, and has an attachment portion to a utility pole or the like at one end in the longitudinal direction.

The reflection plate 2b is housed in the base 2a, and is provided opposite to the light projecting opening 2a1.

The lamp socket 2c is disposed at a required position in the base 2a so that the high-pressure sodium lamp 1 is mounted horizontally.

The ballast 2d has the same specifications as the ballast BR in FIG. 1, and is arranged in the base 2a at a position adjacent to the lamp socket 2c.

The opening / closing frame e is pivotally connected to the other end of the base 2a in the longitudinal direction so as to be openable and closable, and supports the glove 2f.

The globe 2f forms a predetermined light distribution in cooperation with the reflection plate 2b, and forms a predetermined light distribution.
1 is closed to prevent rainwater and dust from entering.

[0108]

According to the first to fourth aspects of the present invention, there is provided an ionizing medium which contains a luminescent metal, sodium and xenon, is enclosed in a translucent ceramics discharge vessel and contains substantially no mercury, Lamp voltage is 35-70V
By lighting a high-pressure sodium lamp having a rated power consumption of 100 W or less by a phase-reduction ballast connected to an AC power supply having a power supply voltage of 90 to 120 V, the ballast is small, lightweight, and inexpensive. In addition, it is possible to provide a high-pressure sodium lamp lighting device in which the price as a lighting system is reduced, lamp efficiency is high, and mercury is not substantially contained, so that disposal of the high-pressure sodium lamp is easy.

According to the second aspect of the present invention, in addition, since the inner diameter of the light-transmitting ceramic discharge vessel is 6 mm or less and the distance between the electrodes is 30 mm or less, the lamp voltage becomes 35 to 40 mm.
A high-pressure sodium lamp lighting device suitable for obtaining a high-pressure sodium lamp with a rated power consumption of 100 W or less at 70 V can be provided.

According to the third aspect of the present invention, in addition, the xenon filling pressure of the high-pressure sodium lamp is 100 to 250 tons.
By using rr, a high-pressure sodium lamp lighting device with high lamp efficiency can be provided.

According to the fourth aspect of the present invention, since the ballast is a slow-type ballast mainly composed of a single choke coil, a high-pressure sodium ballast using a small, lightweight and inexpensive ballast is provided. A lamp lighting device can be provided.

According to the fifth aspect of the present invention, it is possible to provide a lighting device having the effects of the first to fourth aspects.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a high pressure sodium lamp lighting device according to the present invention.
Circuit diagram showing an embodiment of the present invention.

FIG. 2 is a front view showing the same high-pressure sodium lamp.

FIG. 3 is an enlarged sectional view showing the arc tube.

FIG. 4 shows a second embodiment of the high pressure sodium lamp lighting device according to the present invention.
Circuit diagram showing an embodiment of the present invention.

FIG. 5 is a central sectional bottom view showing a security light as an embodiment of the lighting device of the present invention.

[Explanation of symbols]

 AS: AC power supply BR: Ballast SC: Single choke coil PG: Pulse voltage generator PFI: Power factor improving circuit C: Capacitor R: Resistor HPS: High-pressure sodium lamp IB: Arc tube CE: Translucent ceramic discharge vessel E … Electrode OB… outer tube SA… proximity conductor

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shinji Atago 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Litec Corporation F-term (reference) 3K083 AA92 BA12 BC03 BC04 BC18 BC34 CA09 CA31 CA32 5C015 PP05 PP07 5C039 HH02 HH04 HH05

Claims (5)

[Claims] 1. A translucent ceramics discharge vessel, a pair of electrodes sealed at both ends of the translucent ceramics discharge vessel, and a translucent ceramics discharge vessel containing sodium and xenon as luminescent metals to contain mercury. With a substantially free ionizing medium and a lamp voltage of 35
A high-pressure sodium lamp having a rated power consumption of 100 W or less and a power supply voltage of 90 to 120 V
A high-pressure sodium lamp lighting device, comprising: a slow-type ballast interposed between the AC power supply and the high-pressure sodium lamp. 2. The high-pressure sodium lamp has a translucent ceramic discharge vessel having an inner diameter of 6 mm or less, a distance between electrodes of 30 mm or less, and an outer tube in which a vacuum or an inert gas is sealed. 2. The high pressure sodium lamp lighting device according to claim 1, wherein 3. A high-pressure sodium lamp comprising 10% xenon.
3. The high pressure discharge lamp lighting device according to claim 1, wherein the device is sealed at a pressure of 0 to 250 torr. 4. The ballast according to claim 1, wherein the ballast is mainly composed of a single choke coil.
4. The high pressure sodium lamp lighting device according to any one of claims 3 to 3. 5. A lighting device body and at least a high-pressure sodium lamp mounted on the lighting device body.
And a lighting device for the high-pressure discharge lamp according to any one of the above.