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DonaldL

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One of my ballast went out on my retro t-5's. So I replaced both ballast with my spare 660 and it is like day and night.
 
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ShaneV

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Yep, it overdrives the bulbs. Oncreases the light but decreases the lifespan on the bulbs.
 
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ShaneV

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Depends on who you ask :)

According to Andy at IceCap:
Despite overdriving the 54-watt lamps to 80 - 85-watt per lamp output, the lamps are still good for reef use for up to two years.

Others have reported it shortening the life to 1 year.
 
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