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| The lowes store in my area has off brand t8's for very cheap will I get the same out of these as I would the cheap t12's. I understand that it is all in the lumens maintenance hours and so on but i am already using the cheapest t12's I can find and my seedlings are doing great so if i can use a 1.00 t8 vs a 2.00 t12 and get the same results I would be happy. Thanks, Dale |
Follow-Up Postings:
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- Posted by shrubs_n_bulbs z8/9 UK (My Page) on Sun, Feb 25, 07 at 13:39
| Most likely they will work and give out more or less the same light as the T12s. But: |
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- Posted by thepodpiper so. east mi. z6 (My Page) on Sun, Feb 25, 07 at 15:27
| shrubs_n_bulbs, what # on a package of bulbs determines how fast the bulb will lose its brightness. dale |
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- Posted by shrubs_n_bulbs z8/9 UK (My Page) on Mon, Feb 26, 07 at 7:12
| Dale, this information is often not shown, or not shown prominently. It may be listed as lumen depreciation but usually not since that doesn't "sound good". You will find a note on the better tubes to the effect that they lose less than 10% or less than 5% of their brightness. You will commonly find a term called "mean lumens" in tube specs, this is the output at 40% (I think) of lamp life. You want a number that is as close to the "initial lumens" as possible. It is fairly easy to find mean lumens at 95% of initial lumens in a T8 fluorescent tubes. A very long life, which is always listed, is a good sign. Look for something quoting higher than 20,000 hours and you will almost certainly have very good lumen maintenance. All this often ignored because even a 30% drop in brightness is hardly noticeable to our adaptable eyes, but it is very significant to a plant. Fluorecent plant lights have traditionally been discarded once they lose, say 20% of their light. In practice they were just swapped out every six months or a year. Using a tube that maintains 95% of full light output right until it fails means you just run the tube until it fails which might be 5 years or more. |
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