GB556531A - Improvements in and relating to lighting fixtures - Google Patents

Improvements in and relating to lighting fixtures

Info

Publication number
GB556531A
GB556531A GB5043/42A GB504342A GB556531A GB 556531 A GB556531 A GB 556531A GB 5043/42 A GB5043/42 A GB 5043/42A GB 504342 A GB504342 A GB 504342A GB 556531 A GB556531 A GB 556531A
Authority
GB
United Kingdom
Prior art keywords
reflectors
lamps
light
april
shield
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB5043/42A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB556531A publication Critical patent/GB556531A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

556,531. Lighting fittings. BRITISH THOMSON-HOUSTON CO., Ltd. April 16, 1942, No. 5043. Convention date, April 18, 1941. [Classes 75 (ii) and 75 (iv)] In order to shield the observers eyes from excessive brightness while producing a distribution of light flux ot maximum angular spread, elongated light sources such as tubular fluorescent lamps 16 are mounted in trough-shaped elliptical reflecting surfaces 21 with their axes parallel to the focal lines of the reflectors in such positions that a plane A passing through a lower edge of one reflecting surface at such an angle, say 40 degrees, to the horizontal at which it is desired to shield the light source from direct observation is tangential to the light emitting surface and intersects the other reflecting surface at right angles to the tangent plane C. A space may be left between the upper edges of the reflectors to allow the unobstructed passage of light upwardly for an angle of say 94 degrees. The lamps and reflectors are mounted in a rectangular frame carried by spaced rods 13 and are shielded from observation in a longitudinal direction by transverse louvres 18. The sockets 17 supporting the lamps may be of the type described in Specification 526,713, [Group XXXIV]. The reflectors may be of polished aluminium, glass, or plastic backed with metal.
GB5043/42A 1941-04-18 1942-04-16 Improvements in and relating to lighting fixtures Expired GB556531A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US556531XA 1941-04-18 1941-04-18

Publications (1)

Publication Number Publication Date
GB556531A true GB556531A (en) 1943-10-08

Family

ID=21999286

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5043/42A Expired GB556531A (en) 1941-04-18 1942-04-16 Improvements in and relating to lighting fixtures

Country Status (1)

Country Link
GB (1) GB556531A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2707037A1 (en) * 1976-02-20 1977-08-25 Jann Petersen UMBRELLA FOR TUBE-SHAPED LIGHT SOURCES, IN PARTICULAR FOR FLUOR TUBES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2707037A1 (en) * 1976-02-20 1977-08-25 Jann Petersen UMBRELLA FOR TUBE-SHAPED LIGHT SOURCES, IN PARTICULAR FOR FLUOR TUBES

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