Same thing, but quicker. It's the same for all bulbs, including household bulbs. To avoid this spectrum fade it is wise to change bulbs at certain times according to the type of bulb:
Halides 12 months
T5HO 8 months
Compact Fluorescent 6 months
VHO 12 months
Over-driving the bulbs will cause them to fade faster, like say using a mogul halide bulb on an HQI ballast. Using fans on the bulbs to keep them as cool as possible will help them perform better in their usable life as well.
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~ Mindy
SPS fanatic.
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