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Halogen incandescent lamps. Low-voltage mirror lamps with aluminum reflectors. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Halogen lamps
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Non-directional thermal radiation of cold light lamps is advantage when illuminating heat-sensitive materials and a disadvantage in terms of heavy thermal conditions of luminaires. Some types of false ceilings do not allow the use of these lamps due to the possible overheating of the space above the ceiling. For such applications, mirror lamps with aluminum reflectors are available in several varieties.
The first type of lamp represents a model range in standard flasks MR11/MR16, the glass reflectors of which are coated with a layer of aluminum instead of an interference film. The power range, light distribution groups and appearance of these lamps do not differ from the previously described models with interference reflectors.
Their important difference is only the concentration of heat together with the light beam, which does not allow the use of these lamps for lighting heat-sensitive materials from short distances. Visible light does not pass through the aluminum reflector, so the back of these lamps looks completely dark.
The best use for them is the so-called "Spotlights general lighting, built into a false ceiling, sometimes informally called down-lights (from the English term downlight "shining down").
To lamps of the second type includes the so-called 111 series. The models included in it consist of a halogen capsule installed in an open metal reflector with a diameter of 111 mm (Fig. 5.9).
Rice. 5.9. Appearance GLN series 111
The design of such a lamp is similar to that of some car headlights, in which the direct light of the lamp is eliminated by a shading metal cover.
Mirror lamps with a diameter of 111 mm are produced with a power of 35,50,75 and 100 W and are intended for installation mainly in open fixtures, because their ultraviolet radiation is negligible.
Emphatically functional and at the same time aesthetic appearance is an advantage for their use in decorative and functional lamps stylized as "high technologies" (hi-tech). To improve the appearance and better match with the chrome elements of the lamps, the body of these lamps has a polished shiny edging.
The third, less common group of lamps with aluminum reflectors, consists of models with plinth BISd (BA 15d). Models of this group are produced only by some manufacturers and are not standardized. Their use is possible in luminaires specially designed for a specific type of lamp.
Author: Koryakin-Chernyak S.L.
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