It takes almost twice that long to come back to full brightness after a power interruption. Mercury vapor lamps are used whenever high-mounted luminaires are needed for very heavy annual use or where high labor costs make it quite expensive to relamp frequently. ... The initial start up and restart delays are the shortest of all the HID lamps, with full initial brightness after approximately three minutes.
|Title||:||Park planning handbook|
|Author||:||Monty L. Christiansen|