GB843627A - Improvements in and relating to electric fluorescent lighting units - Google Patents

Improvements in and relating to electric fluorescent lighting units

Info

Publication number
GB843627A
GB843627A GB11985/56A GB1198556A GB843627A GB 843627 A GB843627 A GB 843627A GB 11985/56 A GB11985/56 A GB 11985/56A GB 1198556 A GB1198556 A GB 1198556A GB 843627 A GB843627 A GB 843627A
Authority
GB
United Kingdom
Prior art keywords
refractors
over
light
casing
tube
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
GB11985/56A
Inventor
William Edward John Drake
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
Priority to GB11985/56A priority Critical patent/GB843627A/en
Publication of GB843627A publication Critical patent/GB843627A/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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • 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

Abstract

843,627. Fluorescent lighting units. BRITISH THOMSON-HOUSTON CO. Ltd. April 10, 1957 [April 19, 1956], No. 11985/56. Class 75(4). A fluorescent lighting unit comprises an elongated trough shaped casing housing refractors on its opposite side walls, a top cover and means for supporting fluorescent tubes of the type including a coating on the surface of the tube extending over a longitudinal zone which reduces the light intensity over that zone but increases it over another longitudinal zone, the zones of increased intensity being directed to shine light through casing and refractors so that the major part of the illumination is directed outwards and downwards. The fitting may comprise a shallow cover 2 provided with an enlargement 4 to receive the end of a supporting member 3 in the form of a tube, and a transparent trough shaped casing 1 secured to the cover by a frame 7. Three fluorescent tubes 13, 14, 19 are supported within the casing, each having a part 23 coated with material reflecting ultra-violet light e.g. over an arc of slightly more than 180 degrees and are arranged so that the major part of the increased light from the uncoated zones 24 falls on refractors 31 and 32 in the case of the tubes 13, 14 and a pair of refractors 36, 37 in the case of the tube 19. Refractors 36, 37 may be replaced by a reflector of elongated V-shape and reflectors may also be used in addition to the reflectors 31 and 32.
GB11985/56A 1956-04-19 1956-04-19 Improvements in and relating to electric fluorescent lighting units Expired GB843627A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB11985/56A GB843627A (en) 1956-04-19 1956-04-19 Improvements in and relating to electric fluorescent lighting units

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11985/56A GB843627A (en) 1956-04-19 1956-04-19 Improvements in and relating to electric fluorescent lighting units

Publications (1)

Publication Number Publication Date
GB843627A true GB843627A (en) 1960-08-04

Family

ID=9996299

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11985/56A Expired GB843627A (en) 1956-04-19 1956-04-19 Improvements in and relating to electric fluorescent lighting units

Country Status (1)

Country Link
GB (1) GB843627A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3163365A (en) * 1960-03-23 1964-12-29 Thorn Electrical Ind Ltd Lanterns for street lighting
US4891737A (en) * 1988-12-09 1990-01-02 Thin-Lite Corporation Quick fit diffuser lens apparatus
EP2711614A3 (en) * 2012-09-21 2014-05-07 Toshiba Lighting & Technology Corporation Luminaire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3163365A (en) * 1960-03-23 1964-12-29 Thorn Electrical Ind Ltd Lanterns for street lighting
US4891737A (en) * 1988-12-09 1990-01-02 Thin-Lite Corporation Quick fit diffuser lens apparatus
EP2711614A3 (en) * 2012-09-21 2014-05-07 Toshiba Lighting & Technology Corporation Luminaire

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