Working conditions of EL lamps

Brightness, life, and color are also related to the power frequency. Brightness is directly proportional to frequency, while life has an inverse relationship. In fact, at high frequencies, the light output will decrease due to the electrical loss of the light-emitting panel.

After several voltage cycles, the electroluminescent panel can achieve full light output. During its entire long life, there is generally no sudden failure, only a decrease in light output. Therefore, its working life should be expressed as the time required for the brightness to drop to 50% of the initial value. Most electroluminescent panels have a slightly higher brightness in the first few hours, but after thousands of hours, they will decay exponentially according to the frequency of the power supply.

For example: When a green ceramic lamp works at a working voltage of 240 volts, a frequency of 50 Hz, and a current density of 1 ampere/square meter, its initial brightness is about 8 candles/square meter. The green ceramic light-emitting panel used on the aircraft has a brightness of about 15 candles/square meter at 115 volts and 400 Hz. The lamp with organic coating on glass has a brightness of about 80 candles/square meter at 350 volts, 400 Hz and a current density of 1.5 amperes/square meter. The brightness of a fluorescent lamp is about 5000 candles/square meter. The temperature between 0℃ and 100℃ has little effect on the green ceramic lamp, but at -196℃, the brightness drops by about 10%.