Hi,
HPS ballasts slightly overdrive the Radiums and reduces their lifetime by a smidge. Electronic HQI ballasts are closer to the real spec.
Stircrazy,
Are these new bulbs or have they been running for a while ?
For comparison, my tank (90G) has 2 6500K T8s overdrive 2x and one VHO actinic (total power = ~160W and bulbs are 6 months old):
100-120 uE/(m^2*s) @ 24" - 6" air and 18" water
180-200 uE/(m^2*s) @ 19" - 6" air and 9" water
- Victor.
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