Been a long time sence we had a lighting fact thread

[reefburnaby]

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.