I'm with Brad. It seems useful lifespan expectations vary wildly depending on who you ask.
When I used NO O3's, I found I had to replace them at six months, or face cyano blooms (which would go away as soon as the tubes were replaced). But now I run VHO actinics, and I'm thinking, oh, shoot, these tubes are now about a year old. And they still turn on .... so ... I dunno, seems I've gotten away with more than 6 months on these at any rate.
I figure, if nothing else, aim for once per year. If you find that's not enough (only time and experience will tell for you IMO), then step it up and see how that works out..
cheers
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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