Changes in electric current, brightness, and lifespan caused by using a ｌamp at higher or lower voltages than it was designed for are generally the same as those on the separate table. However these changes differ widely between lamps, so this table is only applicable to voltages between 90 and 110% of design specifications, for lamps with a lifespan of less than 5,000 hours. When used at low voltage, the lifespan and brightness of each lamp will vary greatly, depending on factors such as the efficiency of that particular lamp.
The surface temperature of a bulb is generally between 60 and 100°C when used continuously at the voltage for which it was designed, although lamps differ depending on their efficiency and the number of watts they output. Using a lamp in a hermetically sealed environment will cause the ambient temperature to become extremely high, with a significant effect on the efficiency of the lamp. When using bi-pin base lamps, it is especially necessary to allow for spacing between lamps to prevent softening or melting of the nylon bases. Consideration also needs to be given to using measures such as ventilation to cool the interior of the apparatus, in order to maintain an ambient temperature of 80°C or less.
The symbol in the special specification column at the top of the standards table indicates special specifications that Oshino can provide to order. The meaning of each symbol explained below. Oshino will also consider requests for a variety of other specifications.
| TPL | Tin-plated lead wires |
|---|---|
| GPL | Gold plated lead wires, or nickel pins |
| AF | Frosted bulb |
| LE | Bulb with lens attached |
