Lighting for an Outbuilding

jim-neJuly 28, 2009

Hello- we just put up a pole barn and I need help calculating how much light we will need to install this fall. The building is 40' x 80' and the trusses are 18' high. It is primarily for storage and I plan on having a shop in the corner to crank away on projects. My question is how much light (lumens or footcandles) do I need per square foot? From researching it looks like a typical kitchen is 30-40 lumens per sq ft, living rooms are 15-20 lumens so I *think* 10-15 lumens per sq ft sounds reasonable. From this I think I need 40x80x10 (size * lumens) and get 32000 lumens on the floor. Since my lightning will be 18' above how do I calculate how much light do I need to install? I plan on using HPS fixtures and my best guess is 8 fixtures pumping out 400/600 Watts/ea (50000 to 90000 lumens per fixture).

Thanks-

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sevenecho

We use foot candles for most calculations and like 75 for 'shop work', 100 for 'fine work'. Fine work is something like sewing. For storage maybe 35 foot candles will be OK, but try for 75 for the shop area.

We normally take a drawing to the supply house and tell them what our needs are and they do a take off for free. It will include types of fixtures and location. We rarely use exactly what they provide, but it is a good start to get things where we want them.

    Bookmark   July 29, 2009 at 8:59AM
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