It depends on the wattage that you need. I believe HQI comes in 70, 150, 250, and 400... the mogul systems come in 175, 250, and 400 (and higher) watts. The mogul bulbs don't require a glass UV shield, since the bulb is already shielded. Note also that electronic ballasts will run bulbs whiter / bluer than either magnetic or HQI ballasts.
__________________
Calvin
---
Planning a 29 gallon mixed reef...
|