How often do you change your bulbs? - The Planted Tank Forum

 
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post #1 of 9 (permalink) Old 02-15-2013, 03:07 AM Thread Starter
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How often do you change your bulbs?

Just wanted to see what other members are doing? I have a T5 set up, how often to change the bulbs?

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Eheim 2217 & 2236, 2-39wt T5 bulbs (10,000), 72-75*
Pristella tetras, cardinal tetra, amano shirmp, bamboo shrimp, nerite snails, assassin snails and red cherry shrimp.

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post #2 of 9 (permalink) Old 02-15-2013, 03:42 AM
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i try to do it once every 8 months or so. but i doubt it really depends on how often i actually remember to do it.

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post #3 of 9 (permalink) Old 02-15-2013, 04:06 AM
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I have CF bulbs that I forgot they are over 2 years old. I just had them changed last week.

Ive seen a lot of the difference on plant growth and lot more pearlings than the old ones.
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post #4 of 9 (permalink) Old 02-15-2013, 05:29 AM
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I bought 4 for $40 Actinic and 12K off of ebay I going to see if there is any difference between the LFS ones and the ebay ones for life span. The LFS sells theirs for $40 each!

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post #5 of 9 (permalink) Old 02-15-2013, 06:36 AM
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Amazon sells open box bulb for a very low price.
I got two CF bulbs for $10+ each. Free shipping when I reached $25 total order.

These bulbs are Coralife Brand which would sell on ebay for I think over $30 each shipped.
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post #6 of 9 (permalink) Old 02-15-2013, 06:39 AM Thread Starter
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Quote:
Originally Posted by Bubba Shrimp View Post
I bought 4 for $40 Actinic and 12K off of ebay I going to see if there is any difference between the LFS ones and the ebay ones for life span. The LFS sells theirs for $40 each!
I also buy my bulbs from [Ebay Link Removed] I get 4, 6700k for $30 including shipping. Never thought twice about the quality though.

46 Bow Front Planted
Eheim 2217 & 2236, 2-39wt T5 bulbs (10,000), 72-75*
Pristella tetras, cardinal tetra, amano shirmp, bamboo shrimp, nerite snails, assassin snails and red cherry shrimp.

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post #7 of 9 (permalink) Old 02-15-2013, 12:35 PM
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well are the HO or normal output? at 20 bux a bulb i will replace mine when their lifespan hours have been met
which on two of my bulbs will be about 9 months
and 4 of them being on half the time will be 18 months
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post #8 of 9 (permalink) Old 02-15-2013, 03:59 PM
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Check out this article: http://www.lrc.rpi.edu/programs/nlpi.../lat5/pc1a.asp

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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post #9 of 9 (permalink) Old 02-15-2013, 04:47 PM
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Their output is high, but the quality of color changes if im not mistaken
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