Quote:
Originally Posted by jay bell
I followed my electrician's advice and installed 4', 6 lamp T6 fixtures in my hanger this year. They are much brighter than any other fluorescent I have seen, and are efficient to boot.
Jay
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T5HO most likely. T6 is an airplane

They appear brighter than T8's for two reasons; since the lamp is 1/4" smaller in diameter you have much more surface brightness. T5HO are also around 5000 lumens, T8's around 2850 for the standard products. T5HO are hot! Hot as in bright and hot as in they operate at the socket a lot hotter. Make sure you have the lamps seated well in the socket. (most sockets for T5HO are now "twist and lock" to insure a solid connection so they do not burn up.)
They are NOT more efficient. They are about the same as comparable T8's.
I have lit hangars with T5HO. I will not use them unshielded for anything lower than 14' or so. There is simply too much glare.
T5's came into use from Europe (you will notice that they are shorter than T8 because of the standard in Europe). There big advantage is the smaller diameter package which allows engineers to design more sophisticated optics and smaller fixtures. When it comes to a hangar, you usually have no optic, you are not trying to stuff them into a tight space like a cove, nor are you doing a difficult job like grazing a wall or uplighting a surface. So, there is very little advantage and a lot of disadvantages with T5HO for anything under 14'.
14' and above, I prefer them over the old standard HID low bays. However, we are doing a DC3 hangar right now with HID due to owners preference and it will do a nice job. ("new" SCWA ballast and better color rendering lamps have kept HID alive and still sellable.)