hehe, thats for you to decide. if you ask 100 reefers how much of a drop is acceptable you will get 100 different answers and changing bulbs seams to be a personal preferance. the AB's I am using have been running for a year now with no visual indacations of needing to be changed (I need to measure them though to see how much they have dropped off)
one of the big problems with stating a fixed intensity for changing you bulbs is that from the factory there can be a 10%(or more) difference between new bulbs. so it is easyer to take a inital measurment and see how fast they drop off and set a % of drop off for your change.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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