The main differences in performance between the bulbs are that the DE bulbs are more intense for the wattage, but spread their light over a smaller area. They also have more "hot spots". SE bulbs are less intense, but spread the light over a larger area, and have fewer hot spots. Many SE bulbs can be run on HQI ballasts which overdrives the bulb and actually makes the SE bulb more intense than the DE, however this wears the bulbs out a bit quicker, and you should consider replacing them every 8-10 months instead of the usual 12 months for MH bulbs that are operated normally.
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~ Mindy
SPS fanatic.
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