WO2009121753A1 - Spotlight with a louver flange - Google Patents

Spotlight with a louver flange Download PDF

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Publication number
WO2009121753A1
WO2009121753A1 PCT/EP2009/053435 EP2009053435W WO2009121753A1 WO 2009121753 A1 WO2009121753 A1 WO 2009121753A1 EP 2009053435 W EP2009053435 W EP 2009053435W WO 2009121753 A1 WO2009121753 A1 WO 2009121753A1
Authority
WO
WIPO (PCT)
Prior art keywords
spotlight
lens
flange
louver
outer edge
Prior art date
Application number
PCT/EP2009/053435
Other languages
French (fr)
Inventor
Flavio Mauro Sangiorgio
Original Assignee
Fael S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to ITMI2008A000576 priority Critical
Priority to ITMI20080576 priority patent/ITMI20080576A1/en
Application filed by Fael S.P.A. filed Critical Fael S.P.A.
Publication of WO2009121753A1 publication Critical patent/WO2009121753A1/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V31/00Gas-tight or water-tight arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/14Adjustable mountings
    • F21V21/30Pivoted housings or frames
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/08Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10Outdoor lighting
    • F21W2131/107Outdoor lighting of the exterior of buildings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40Lighting for industrial, commercial, recreational or military use
    • F21W2131/406Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios

Abstract

There is described a spotlight (1) with a louver flange (5) comprising a hollow body (50) with an inner edge (9) which may be sealably coupled with the spotlight (1) free of lens (6), and an outer edge (10) sealably supporting the lens (6). Said spotlight may further includes a spacer (7) with an outer coloured filter (8) which may be fitted on outer edge (10) of the hollow body (50) with lens (6), i.e. downstream of lens (6).

Description

"Spotlight with a louver flange" * * *

DESCRIPTION

The present invention relates to a spotlight with a louver flange. Louver flanges (or simply louvers) for outdoor spotlights are known to be used in order to control the luminous flux and direct it towards the zone to be illuminated, thus limiting the output angles of the light rays that would generate dazzling thus reducing the scattered light as well as the maximum intensity and efficiency. The louver (typically made of welded steel) is usually fitted downstream of the spotlight lens (or glass). If the spotlight is facing upwards, e.g. for illuminating the facades of buildings or monuments, a considerable increase in the lens temperature occurs. The maximum temperatures allowed on the lens are about 260 0C, beyond which breaks occur (especially in case of rainy weather).

Considering the geometrical measures of the spotlight, for over 1,000 watts lamps, fitting traditional louvers generates a thermal state such that temperatures reach unacceptable levels. Considering that the illumination (in particular the one for upward projection) required considerable powers, the 260 0C thermal limitation is rapidly exceeded.

Ceramic glasses are currently used in order to solve the problem, which are however very expensive and fragile.

The situation worsens in the case of applying coloured filters, e.g. made of paste, which become increasingly heated (beyond 300 0C with 1,000 watts lamps) than a transparent lens because of the absorbed light radiation, even if the spotlight is facing downward.

It is therefore the object of the present invention to implement a spotlight with a louver flange which reduces light-scattering and limits the lens heating up, while preserving acceptable performances in terms of optical efficiency (η) and maximum intensity (Imax) of the light source. In accordance with the invention, such an object is achieved by means of a spotlight with a louver flange, characterized in that said flange comprises a hollow body with an inner edge which may be water-tightly coupled with the lens-free spotlight, and an outer edge supporting the watertight lens.

These and other features of the present invention will be made more apparent by the following detailed description of an embodiment thereof, illustrated by way of non- limitative example in the accompanying drawings, in which: figure 1 shows a front view of a spotlight with a louver flange according to the invention; figure 2 shows a section view according to line H-II in figure 1 ; figure 3 shows a section view similar to that in figure 2 with a spacer included. With reference to figures 1 and 2, there is shown a spotlight 1 equipped with a mount 2, a reflecting parabola 3, a light source 4 and a louver flange 5 made of pressed aluminium.

Louver flange 5 consists of a thin hollow body 50 having an inner edge 9 and an outer edge 10. The inner edge 10 of louver 5 has simply been sealably fitted on the outer edge 20 of spotlight 1 from which lens 6 has been removed, which lens has instead been sealably fitted on the outer edge

10 of louver 5.

The watertight volume now also includes the space contained in flange 5. Therefore, the heat produced by lamp 4 dissipates more and lens 6 heats up much less, particularly if the spotlight is directed upward.

The traditional louvers are simply fitted on the outer edge 20 of spotlight 1 including a lens 6, simply aiming at limiting the light-scattering against the above-mentioned disadvantages.

The experimental results (efficiency means the percentage ratio of the flux of spotlight 1 to the flux of lamp 4) obtained by means of a commercially available automatic photogoniometer (LMT model GO- V 1900) are quoted below and are intended to appreciate the differences between the same spotlight 1 (a 1,000 watts LM ONE produced by the present Applicant) equipped with a traditional louver and with a louver flange 5 according to the invention.

Table: efficiency and maximum intensity, the reduction in light-scattering being equal.

Figure imgf000005_0001

Table: temperatures for an upward facing spotlight, i.e. under extreme heat conditions of usage.

Figure imgf000005_0002

In the first Table, we may appreciate an increase in efficiency and, especially, in the maximum intensity which substantially remains equal to the case of louver lack, i.e. the maximum intensity remains constant though decreasing the scattered light.

By analysing the second Table, a considerable temperature drop may be noted, which allows even 2,000 watts spotlights to be used in complete safety.

With a blue-coloured lens (the blue filter creates the worst thermal situation), again with the spotlight facing upward, a temperature of 190 0C is reached with a 1,000 watts spotlight, otherwise exceeding 300 0C. On the other hand, by using 2,000 watts spotlights, we are well beyond 300 0C even with the flange 5 according to the invention.

In figure 3, a spotlight 1 is shown according to the configuration in figure 2, to which a spacer 7 has been added which pulls a coloured filter 8 fitted thereon away from the light source 4, thus reducing the thermal exposure thereof. The space between the lens 6 fitted on louver 5 and the coloured filter 8 is non-sealably ventilated in order to scatter the produced heat. In this embodiment, acceptable temperature values are achieved even by means of 2,000 watts lamps.

Claims

1. A spotlight with a louver flange (5), characterized in that said flange (5) comprises a hollow body (50) with an inner edge (9) which may be water-tightly coupled with the spotlight (1) free of lens (6), and an outer edge (10) supporting the watertight lens (6).
2. A spotlight with a louver flange (5) according to claim 1, characterized in that it includes a spacer (7) with an outer coloured filter (8) which may be fitted on the outer edge (10) of the hollow body (50) with lens (6), i.e. downstream of lens (6).
3. A spotlight with a louver flange (5) according to claim 1 or 2, characterized in that said flange (5) is made of pressed aluminium.
PCT/EP2009/053435 2008-04-03 2009-03-24 Spotlight with a louver flange WO2009121753A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ITMI2008A000576 2008-04-03
ITMI20080576 ITMI20080576A1 (en) 2008-04-03 2008-04-03 "Projector with louvre flange"

Publications (1)

Publication Number Publication Date
WO2009121753A1 true WO2009121753A1 (en) 2009-10-08

Family

ID=40296843

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/053435 WO2009121753A1 (en) 2008-04-03 2009-03-24 Spotlight with a louver flange

Country Status (2)

Country Link
IT (1) ITMI20080576A1 (en)
WO (1) WO2009121753A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2124417A (en) * 1937-06-18 1938-07-19 New York World S Fair 1939 Inc Lighting fixture
US5050055A (en) * 1989-08-28 1991-09-17 Uvp, Inc. Heat dissipating high intensity lamp housing
US5091835A (en) * 1991-02-25 1992-02-25 Leonetti Company High intensity lamp with improved air flow ventilation
WO1994010499A1 (en) * 1992-11-05 1994-05-11 Cunningham David W Lighting fixture
DE9420171U1 (en) * 1994-12-16 1995-04-06 Kass Christian Adjustable area lamp for stage and studio
DE29705097U1 (en) * 1997-03-05 1997-12-11 Schaettgen Horst Color filter attachment with color filter changer
FR2755750A3 (en) * 1996-11-08 1998-05-15 Specta Lux Lg Filter holder fitted with colour filter illumination projector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2124417A (en) * 1937-06-18 1938-07-19 New York World S Fair 1939 Inc Lighting fixture
US5050055A (en) * 1989-08-28 1991-09-17 Uvp, Inc. Heat dissipating high intensity lamp housing
US5091835A (en) * 1991-02-25 1992-02-25 Leonetti Company High intensity lamp with improved air flow ventilation
WO1994010499A1 (en) * 1992-11-05 1994-05-11 Cunningham David W Lighting fixture
DE9420171U1 (en) * 1994-12-16 1995-04-06 Kass Christian Adjustable area lamp for stage and studio
FR2755750A3 (en) * 1996-11-08 1998-05-15 Specta Lux Lg Filter holder fitted with colour filter illumination projector
DE29705097U1 (en) * 1997-03-05 1997-12-11 Schaettgen Horst Color filter attachment with color filter changer

Also Published As

Publication number Publication date
ITMI20080576A1 (en) 2009-10-04

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