DE lights produce higher lumens then a traditional singles and last much longer. Traditional bulbs should be replace 2-4 times a year, whereas DE bulbs last almost a year before needing to be replaced.
Using a lumen tester we compared the Vanquish Lighting digital ballast and hood against the Phantom digital ballast and hood. Booth hoods used where enclosed and both systems used a generic double ended bulb. Using a Victor digital lex meter we measured the lumen of both systems and a standard HPS single lamp.
Comparison of different 1000 watt Grow lights.
When using DE bulbs more blue light from a T5 or metal halide should be used to supplement your grow. Also, DE put out more heat then single HPS, so they need to be air cooled or raised higher over a plants canopy.