JohnRosario Posted December 2, 2008 Report Share Posted December 2, 2008 I have read in a couple of posts, people replace their T5 bulbs every 6-8 months. They stated they did this because there was a decreased in red spectrum light out put. That didnt seem 100% correct with me so I decided to contact the Illuminating Engineering Society of North American and they placed me in contact with a person from the GE Lighting R&D department. GE stated that while lumines do decrease over time (3500 from new to 3220 at there end of their life) The red spectrum lighting does not decease at a greater rate then the other parts of the light spectrum. I wonder where people got their info on replacing T5 Bulbs so frequently? Quote Link to comment Share on other sites More sharing options...
jvision Posted December 2, 2008 Report Share Posted December 2, 2008 I'm not sure where you're reading this... reef sites, maybe? IME, T12s need to be replaced every 6 mos, T8s about every year, and T5s/PCs should be good for plants 'til they burn out. Quote Link to comment Share on other sites More sharing options...
werner Posted December 2, 2008 Report Share Posted December 2, 2008 I have read in a couple of posts, people replace their T5 bulbs every 6-8 months. They stated they did this because there was a decreased in red spectrum light out put. MH bulbs degrade in light output and may shift in color over time (towards the red end of the spectrum.) This may have been inferred for fluorescent bulbs too. Quote Link to comment Share on other sites More sharing options...
Baos Posted December 3, 2008 Report Share Posted December 3, 2008 When I bought my t5ho they told me after 12 months. After a period of 2 years it seemed to be very dull. I've since replaced the bulbs. fyi anyone wants a cheap t5ho store pm me. Quote Link to comment Share on other sites More sharing options...
devocole Posted December 3, 2008 Report Share Posted December 3, 2008 sweet, i had it in my head that i needed to replace the T5s every 4 months or so. good to know Quote Link to comment Share on other sites More sharing options...
firestorm Posted December 11, 2008 Report Share Posted December 11, 2008 I've had mine for almost a year now over top of plants, and the plants seem to be growing just fine still, with a little bit of algae Quote Link to comment Share on other sites More sharing options...
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