The only thing better than a double ended bulb...is an InterLux™ double ended bulb. Beats the competition in every way, InterLux™ double ended bulbs are true champions. These bulbs perform at the highest possible level and save you money! Compared to single ended lamps, InterLux™ double ended bulbs are more effeciant by using the same wattage to produce higher par and lumen ratings.They have a higher red spectral ratio enhancing flowering and growth. InterLux™ double ended bulbs also provide minimal light deterioration for maximum intensity and lifespan. 5 reasons why InterLux™ double ended lamps are superior to traditional HPS bulbs: 1. They are more efficient, using the same 1000 watts to produce higher par and lumen ratings 2. Longer life-spans, 3. Less light deterioration 4. Higher red spectral ratio enhancing flowering & growth 5. Minimal light deterioration for maximum lifespan & intensity Compatible with high frequency electronic ballasts. One Year Warranty.