Some of the OP's posts may have been lost in the CPF crash but I found the following info:
http://www.candlepowerforums.com/vb/showthread.php?307758-storage-building-lighting
storage building lighting
trying to decide what indoor lighting to get for a 50'x40'x12' building. Looking for something fairly efficient. ... I am located in north west indiana and the building will not be heated.
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Some things to consider:
For a permanent installation you will have to meet code unless the system(s) are 24V or less. That means all parts above 24V need UL or UR listing. ebay, Chinese websites are off limits.
LEDs need 10 square inches of heatsinking per watt. A 50 watt LED needs 500 square inches of metal surface to dissipate the heat. Unless you use fan cooling. (That little fixture you was looking at won't do.)
Unless you are using good LEDs like
Bridgelux the LED arrays are not that efficient. 30 lumens per watt. CFLs are 60 lumens per watt. Linear tubes about 50% better.
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What kind of lighting do you have in the building now? That works in the summer but not in winter. I can't see you wandering around the place with just a flashlight for a year. (That very 1st post of yours was a year ago.)
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Cree have some
Architectural Troffers that are direct replacements for 2'x4', 2'x2', 1'x4' linear fluorescent fixtures but they are very expensive. (Cree's PAR38 bulbs are 2X to 3X the price of the competition.)
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If you are using linear fluorescent now you can replace them with
LED tubes. You will need to replace the ballasts with drivers or remove the ballasts and direct drive (depends on the tube).
There are a lot of crap LED tubes out there that may not last more than 6 months. Buy from reliable sources not ebay.
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For an off the shelf start from scratch system consider installing a bunch of downlights (say one in every 10'x10' area) and using a
BR40 LED Flood Light Bulb. Please note some of HD's other LED 'flood lights' look like PAR spotlights to me and may have too narrow a beam.