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Discussion Starter · #1 ·
Hey,
I have had these two old 18W T8 Tubes for more than 2.5 years (one of them maybe even 3.5).
Is it possible that though i cannot recognize it, the light produced has gotten "weaker"?



Thanks guys.
 

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Discussion Starter · #5 ·
okay, i've bought new T8's.
Same watt rate. seem to work fine.
I think i can tell a slightly better light than the old one.
But it could have something to do with the colour (new one's are 865).
 

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Discussion Starter · #9 ·
That was all very interesting to read, guys!
Here is a picture of the new bulb:



Osram Cool White 18W, 865, 1300Lm.
It was the best the shop had for planter aquarium as far as I could tell.
I also bought Anubis that turned up as I unraveled it, that had three nice rhizomes.
Here are a few photos from after the redesign.





BTW, i guess that i'll need to get at least 90W of light for growth of low-tech plants right?
180L, only fertilizing once in a while with Sera Florena and planted JBL's "7 Balls" near the roots.
 

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Discussion Starter · #13 ·
great look tank and I like your tank driftwood setup.
Thank you very much!
It took me awhile to think of it but now there's no other way I can imagine arranging it.

Hi EQUINOX,

According to GE Technical Pamphlet TP-105 typical lumen loss is -10% at 1,500 hours use; -20% at 2,500 hours use; -30% at 5,000 hours use; and -40% at 11,000 hours use. So after a year of 8 hours use per day, your lumens are reduced about 20%.
Just to make sure: this is relevant to T8 bulbs?
Thanks.
 
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