Overdriving bulbs reduces the lifespan. I knew that going in and was prepared to replace bulbs at that schedule. That said...
On a normal ballast, I think 9 months is a good time to replace MH and actinics. I have gone as long as 12 months and you definately see a much bigger increase in intensity when you let bulbs go that long.
On a normal ballast, I think 9 months is a good time to replace MH and actinics. I have gone as long as 12 months and you definately see a much bigger increase in intensity when you let bulbs go that long.