Emergency Lighting FAQ’s
Can any UPS battery back-up be used for emergency lighting?
NO. Emergency lighting systems are governed by UL924 standards. Only lighting inverters that have been tested and certified to this standard can be used.
Do lighting inverters ensure constant illumination of high pressure sodium and other HID lighting fixtures?
Only those lighting inverters that deliver voltage regulation and no break transfer, such as the “eLITE” family of inverters, will protect these lighting systems. Losing 1/2 cycle causes HID lamps to extinguish, and they require up to 10 minutes to restart!
How important is the transfer time?
Transfer time is the time it takes to recognize and deliver emergency power. In some rare cases, this may not be an issue, but for most cases, it should be ZERO. Zero transfer time insures that there is no interruption of power; a very important factor with HID lighting systems such as high pressure sodium lighting. Lighting control systems and alarm circuits can also be powered by a no-break transfer inverter.
Is there a difference in lighting inverters?
YES! Lighting inverters differ in switch time, voltage regulation, and power conditioning. The standards for emergency lighting inverters are defined in the UL924 test procedures. These procedures omit the difference in characteristics. Some inverters may take up to 10 seconds to respond to a power outage, while others provide a seamless transfer. The seamless transfer systems provide the kind of power necessary for HID, lighting control, and alarm circuits.
Should lighting inverters include voltage regulation and power conditioning?
YES. Voltage regulation ensures that voltage drops and brownouts do not affect the overall lighting system. Voltage regulation also ensures proper lighting levels during normal operating conditions in “Normally On” circuits. Power conditioning prevents surges and transients from reaching the electronic ballasts, thus providing longer life of the lighting fixture.
What is a lighting inverter?
A lighting inverter is an electronic system that converts DC battery power to standard AC voltages to provide back-up for lighting systems. This inverter provides convenient power for many styles of lighting; increasing its usability.