HORTILUX Metal Halide spectrum outperforms most grow lamps because of high initial light intensity and consistent spectral output. The best vegetative spectrum for beginning stages of plant growth.High initial light intensity and consistent spectral output. 30% better spectral maintenance than other manufacturers. Prolonged lamp life and reduced lamp replacement costs. Are made in the USA. Feature the exclusive HORTILUX Spectrum. For best results, use only with ANSI rated M47/E. Must be used in an enclosed fixture only. M1000B/U/BT37/HTL operates in a universal burning position. 2x - 1000 Watts Eye Hortilux Metal Halide (MH) Light Bulb. We respond to all emails within 24 hours and most emails will receive a response immediately. Items that arrive DOA (Dead on Arrival) will be replaced free of charge by another of the same model. The item "EYE Hortilux 1000w watt MH Metal Halide BT37 Grow Light Bulb Lamp 2 Pack Special" is in sale since Friday, June 6, 2014. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Gardening Supplies\Hydroponics & Seed Starting\Grow Light Bulbs". The seller is "clearance_products" and is located in Whittier, California. This item can be shipped worldwide.