Sun System® LEC® Brand 630 Watt Light Fixtures utilize cutting edge Light Emitting Ceramic® brand technology. This fixture has a dual horizontal lamp configuration offering increased wattage in a single fixture design. It has a 98% reflective German aluminum insert and 95% reflective textured corners for excellent output, uniformity and diffusion. Highly efficient agriculturally engineered CDM-T Agro 315 Watt lamps (included) for LEC® brand fixtures. 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 lamps with high 92 CRI and 33,000 initial lumens (105Lm/W). Long life 20,000 hour lamps. 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 ballasts rated for 50,000 hour ballast life. Philips electronic ballast incorporates built in thermal protection. US Patents: D732,236, D756,026. US Patent Pending: 25/516,347. Chinese Patent: ZL201430548157.9. One year warranty on lamps.