Aluminum heat sink, No UV, IR or RF interference, Patented heat sink and optical diffuser, longer life than incandescent & fluorescent tube. No mercury, no ballast required, wide voltage and constant design, solid state, high shock & vibration resistant, Mercury free, 66%+savings in energy consumption, quiet, no noise, no flickering.The products are in accordance with CE, RoHS, UL and FCC testing standards. Color Temperature: Warm White:2600-3700K Narural White:4000-4800k Daylight White:5000-6500k COOL White:6500-7500k