Soffit in the interior. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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Whatever the purpose of the lamp, its kit necessarily includes a lampshade or reflector that limits the dispersion of the light flux and directs it to a functionally important area. Hence the increased demand in electrical stores for unusual chandeliers, sconces, floor lamps. And many take it upon themselves to make them.
The Romanian magazine "Technium" offers a universal household lamp in terms of application possibilities, which gives a sufficiently directed light flux and at the same time does not have a lampshade. These properties are due to the use of a relatively new type of electric lamp - soffit. The fact is that with a sufficiently large already variant design, the soffit lamp differs from the usual one in two main features: a large mushroom-shaped bulb and a reflective or coloring layer applied to it from the inside. It is he who acts as a reflector or lampshade. On the basis of a soffit lamp, table, ceiling or wall lamps, floor lamps can be made. Moreover, the main unit, including a casing with a cartridge and a lamp, is the same for all options.
The cartridge is used standard, better - porcelain, since with a high power of the lamp (and they are from 60 to 500 W), excessive heating of it is possible. It is mounted on its own nut in a cylindrical body made of sheet metal 1 mm thick. For better cooling, it is desirable to perforate the workpiece by drilling or punching (from the front side) several rows of holes. Bend it into a cylinder on a round mandrel, solder the joint, and on both sides of the seam - in the middle of the length of the casing - attach two eyes for the swivel connection with the rack. From one of the ends of the casing, attach with rivets or solder a strip of sheet metal - the cartridge bracket. It remains to install the cartridge itself and screw in the lamp - the lighting unit is ready.
Rice. 1. Soffit - table lamp (click to enlarge): 1 - reflective part of the bulb, 2 - cartridge casing, 3 - stand 4 - stand-base, 5 - cord 6 - hinge screw, 7 - cartridge shank with nut, 8 - bracket cartridge, 9 - hinge eye
Rice. 2. Comparative diagram of the light scattering of a conventional lamp (A) and a spotlight (B).
Rice. 3. Options for solving a lamp using a soffit: overhead light and floor light.
Now any lamp can be obtained from it, it is enough to connect the corresponding rack or bracket with the lugs of the casing. The illustrations provide hints for possible solutions.
See other articles Section Lighting.
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