The Planted Tank Forum - View Single Post - How often do you change your bulbs?
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post #8 of (permalink) Old 02-15-2013, 03:59 PM
Higher Thinking
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Check out this article:

The average life span of most T5s and T8s is 20,000 hours. That's like 5 years. Even after 40 percent of their life span if used up (22 months) T5s still have 94% output. So if you're changing bulbs every year, or even worse, every 8 months, your are spending a great deal of money to regain a couple percentage points.

The article is ten years old, but I think that makes for an even stronger case as bulb quality and efficiency has only improved over the years.
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