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As solid state lighting technology promises and delivers higher levels of efficient and cost effective lighting, luminaires using LED lamps have become the fastest growing product segment for general lighting. As with other lighting technologies, luminaires using solid state lighting installed in the path of egress must meet life safety code requirements for emergency illumination. The Life Safety Code mandates that emergency illumination shall be provided for no less than 90 minutes in the event of failure of normal lighting.
Emergency lighting for fluorescent lamp technology may be accomplished by using backup generators or central lighting inverters but is most often accomplished by providing emergency battery packs located in select luminaires. Fluorescent battery packs are typically chosen because they are virtually invisible to the end user, can be easily installed in the field or at the factory, and have lower initial costs especially for smaller buildings. The downside to using fixture-mounted fluorescent battery packs is that they reduced lumen output and the output is optimized for a specific lamp/ballast combination.
Solid state lighting is so new and most LED luminaires incorporate a customized lamp/driver, resulting in very few UL-approved, field-installable LED battery packs. So how does one provide emergency power to those fixtures that use new solid state lighting technology? Dual-Lite offers the following solutions:
