Because of the high pressure needed, several minutes are required for the lamps to reach full brilliancy. If the current is interrupted, even momentarily, the arc will extinguish and 5–10 min. will be needed before the lamp cools and can be relit.
Because of the high pressure needed, several minutes are required for the lamps to reach full brilliancy. If the current is interrupted, even momentarily, the arc will extinguish and 5–10 min. will be needed before the lamp cools and can be relit.