I put the T8 ballast powered T5 fixture outside with it around 25°F.
The tubes came right on, a little weak at first but warmed up after a few minutes, coming to full brightness much slower than a real T5 HO ballast, not as bright either, but it works good enough considering the price.
These fixtures are fully enclosed, so eventually they will warm up, exposed tubes may not get warm enough to achieve full brightness when it's around 20°F.
Definitely use LED for cold climates if the lights will not be enclosed and if used in unheated areas.
Last edited by oil pan 4; 03-18-18 at 09:39 PM..
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