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 efficient 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.