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Sun System® LEC® Brand 315 Watt Light Fixtures utilize cutting edge Light Emitting Ceramic® brand technology. Fixture has 98% reflective German aluminum insert and 95% reflective textured corners for excellent output, uniformity and diffusion. Highly efficient agriculturally engineered CDM-T 315 Watt LEC® brand lamp (lamp included). Greatly improved full color light spectrum out of next generation ceramic lamps. Higher amounts of beneficial UV and far red spectrums increase the lamps growth power to the plants. Very high 1.95 PPF (photosynthetic photon flux) per second light source. 3100°K Green Power or 4200°K color temperature, high 92 CRI, 33,000 initial lumens (105Lm/W). Long life 20,000 hour lamp. High 90% lumen maintenance @ 8000 hr. High 85% PPF maintenance @ 20,000 hr. Unique open rated lamp construction reduces radiant heat from the arc tube and is suitable for open fixture use. 50/60 Hz low frequency, square wave, highly efficient Philips electronic ballast rated for 50,000 hour ballast life. The Philips brand electronic ballast incorporates built in thermal protection. All models have a 6 foot power cord. US patents: D745,993, D739,595 and US patents pending: 29/539,674. Chinese patent: ZL201430011816.5. One year warranty on the lamp.