Some new hinds of fluorescent lamps recently developed such as HO Lamp, VHO Lamp, Power Groove Lamp and Double Flux Lamp, radiate more luminous flux than general line lamps. Here are discussed some problems on the fundamental design of these higher output lamps.
In Part 1 the following are described about the lamps of T-12 filled with argon gas at 2.2 mm Hg. pressure.
1. The experimental data reveal the relations heween the bulb wall temperature and the lamp characterisics for higher lamp input.
2. We may expect for higher output lamps the increase of luminous efficiency by cooling bulb wall or by lowering mercury vapor pressure. The degree of cooling effect varies according to the cooling methods, lamp input and lamp length. In this paper we discussed the following two cases of practical cooling methods.
(a) cooling by varying electrode structures and dimensions (electrode method)
(b) cooling by the side tube (side tube method)
The results are as follows:
(a) Higher the lamp input is, larger the cooling effect is.
(b) For the short lamp length the side tube method is more effctive than the electrode method, but when the lamp length is long, the difference between these two methods becomes very small.
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