Many more fixtures.
lighting job
I need to install new light fixtures in a 45'x90' pole barn that is completely open inside, it is not heated. The rafters are 12' above the floor and the light needs to be sufficient to work in. The owner of the building said to put up cheap halogens and I told him that they were not a great option.
What is the best light for this application when total cost over the life of the fixture is considered? I figured 48" t8 lights with 4 lamps per fixture, 6 or 8 of the lights evenly spread through the shop.
What is the best light for this application when total cost over the life of the fixture is considered? I figured 48" t8 lights with 4 lamps per fixture, 6 or 8 of the lights evenly spread through the shop.
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If its un heated you may need to consider high output flourescents.
Which are pricey. Maybe some low bays?
Which are pricey. Maybe some low bays?
Depending on your temperature range I'd go with either T5 or T8 F-bay fixtures. If you put in something without a reflector, he'll be disappointed.
I'm pretty unfamiliar with all the available lighting choices out there. What's the difference between a high bay and a low bay? Dispersion characteristics? What's an f-bay?Depending on your temperature range I'd go with either T5 or T8 F-bay fixtures. If you put in something without a reflector, he'll be disappointed.
The shop will go between 20°f-100° f depending on season. I was under the impression that t5's don't like low temps.
..........what ever you pick don't "barn job " it:whistling2::laughing:.....
Aint it great to be a designer too?I'm pretty unfamiliar with all the available lighting choices out there. What's the difference between a high bay and a low bay? Dispersion characteristics? What's an f-bay?
The shop will go between 20°f-100° f depending on season. I was under the impression that t5's don't like low temps.
I would go with high bay.
T8's aren't as good for low temps but they have improved them. If you're interested, I'd go to one of the name brand lighting company's web site (Cooper etc.) some of them have lighting calculators and layout tools to get the footcandles you're looking for with a specific fixture.I'm pretty unfamiliar with all the available lighting choices out there. What's the difference between a high bay and a low bay? Dispersion characteristics? What's an f-bay?
The shop will go between 20°f-100° f depending on season. I was under the impression that t5's don't like low temps.
So looking into osha rules for warehouse illumination I found that they require 5 lumens per square foot. That would be 8 32 watt t8 lamps (2800 lumens per) before any calculation for loss. Is this right? I don't have any reference for what 5 lumens per square foot would be, sounds pretty dark to me though.
250 watt metal halide fixtures.
That's not a lot of light. I think for a shop we'd shoot for more like 45 footcandles. I think 1 footcandle =10.76 lumensSo looking into osha rules for warehouse illumination I found that they require 5 lumens per square foot. That would be 8 32 watt t8 lamps (2800 lumens per) before any calculation for loss. Is this right? I don't have any reference for what 5 lumens per square foot would be, sounds pretty dark to me though.
Are those practical considering they use 4 times the power of a 2 lamp t8? How many lumens do they put out?250 watt metal halide fixtures.
Are those practical considering they use 4 times the power of a 2 lamp t8? How many lumens do they put out?
250w = 13000 lumens.
T5ho 4 lamp fixtures with white reflectors. Lay it out with lithonia or coopers website. Usually a supply house will lay it out for you if you buy the fixtures from them. T5hos usually have a min start temp of -20f.
At 12' above the floor? No way manmbednarik said:T5ho 4 lamp fixtures with white reflectors. Lay it out with lithonia or coopers website. Usually a supply house will lay it out for you if you buy the fixtures from them. T5hos usually have a min start temp of -20f.
Looks fine on my lighting program. I am getting almost the same min to max and t8's w/ reflectors. So why again won't it work?
The t5s cost too much I'd go with 6 bulb t8 highbays and id only put in 8
I'd throw some metal halide high bays in there. If this is like a side job or a personal project, keep an eye out on craigslist or a local Facebook buy & sell group, those sort of things pop up there all the time.
If it's a professional job, some decent quality high bays can be had for a reasonable price if you look around. I helped a guy do a pole barn a while back and we managed to scrounge up four 400w metal halide high bays. It's not enough light to make the place really bright but it certainly provides adequate general lighting.
If it's a professional job, some decent quality high bays can be had for a reasonable price if you look around. I helped a guy do a pole barn a while back and we managed to scrounge up four 400w metal halide high bays. It's not enough light to make the place really bright but it certainly provides adequate general lighting.
I would go with 8 foot T5HO strips. 80 bucks a piece. Any type of high bay will be way to spotty at a 12 foot mounting height.
Throw some reflectors on if you want.
Throw some reflectors on if you want.
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