Loose Neutral

This guy has low bay lighting 250w per fixture in his store and wants to change them out. I suggested 6 tube t-8's He's thinking led. Are these led's putting out the same lumen's per tube or ? I know the led's are expensive. I have little experience with them. Anybody have any experience on these led's vs. the t-8's?

HARRY304E

I would go with T-5 ,HO's you will get more light from a four lamp fixture.

I do not know how the LED's would do in this case you should go and look at a job that has been done like that first.

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Loose Neutral

Yeah, thanks I meant to say T-5. Damn now the title is all screwed up.

Loose Neutral

I wonder what the lumens output of the led would be compared to the t-5?

HARRY304E

I did not read all this stuff but check it out and see if it helps.

http://lumiversal.net/upload/T5%20v.%20LED.pdf


http://lumiversal.net/upload/LED%20v...0Part%20II.pdf








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Loose Neutral

Thanks Harry You da man. I just got off the phone with the united rep and he basically said the same. Leds are expensive as hell and don't perform as well as the T-5.

electricalwiz

If the existing fixture is a 250 MH, you would replace that with a three lamp T5. A six lamp T5 would be way to bright. The T5 that I use are 5000 lumens per lamp

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Loose Neutral

The problem is not enough light. He basically has 2 250 watts lights covering a 1250 sq area 25*50. There are 5 mini rows. I was going to put 2 4 lamps in each row. The rows are about 25' long and the lights will be about 12-14' AFF. It's a liqour store, so this guy wants lot's of light. Does this seem like over kill?

electrictim510

What are you getting quotes per bulb average with driver? We have a manufacturer who has some nice ones for a decent price. Ill check the price now..

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Loose Neutral

I'm going with the T-5s. Thanks though.

electrictim510

I believe the cost was somewhere around $60-$75 per bulb with driver included and 100k claimed life of the bulb.

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"Understand one thing every one has a place in this trade, and no matter what your skill set I doubt you know it all." brian john

Electric_Light

T8s and T5s are more or less comparable in performance. If it gets really hot (i.e. high bay in unconditioned warehouse in Texas), T5 AMALGAM is better.


Not an intrinsic benefit to T5 design. Its just that T5 amalgam lamps are more readily availble than T8 amalgam(never seen one personally).

Since you said its low-bay, I would go with T8s. The lower surface brightness of T8s mean less glare.

T5 28W lamps are basically useless when you have enough room to accommodate T8s and T5 HOs are very bright on surface, so they glare.

T5HO/54W and F32T8 are common lamps in MRO use.
28W T5s are rather low volume oddball lamps.

If the existing lamps are PROBE START 250W, then 14,000 lumens is a fair mean output. If it's pulse, then around 19,000.
Brand new, they're about 21,000 either way.
So, a 6 lamp T8 with 0.87(normal) or (.77) low or 4 lamp high (1.18) will approximate probe start 250W.

A 6 lamp T8 high (1.18) or 4 lamp T5HO will compare with 250W pulse start. Home Depot 6lamp 95% reflector 1.18 T8 SKU 187271 is around $87. F32T8 RE80 lamps should be about $2.25 ea in quantity. So, complete fixture + lamps would only cost about $100.
I don't know what kind of store your customer operates, but if it's 3500K is generally good and is warmer looking than MH.

That Lithonia from HD is meant for commercial use with 120-277v ballast.

5,000K works good for production environment and 4100K if you want the generic Super WalMart like look.

chicken steve

EL,
perhaps you could expand on the led's anchor sized heat sinks? ~CS~

Loose Neutral

It's a liquor store and he wants lot's of light. Do you think the t-5 4 lamp is overkill?

Dnkldorf

If you mean, you would use 8' (4 lamp) fixtures for the rows, this sounds doable. I'd still use T-8 fixtures, over T-5, and would use 841 bulbs.

HARRY304E

No I do not think so ,But you may want to look into the 3500K lamps like Electric_Light suggested.

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captkirk

go with the t5.... led are expensive and overrated for your application.. IMO leds are good if light color and intensity arent important. in your case you want as much light as possible.. You wont get that with led and if you do be prepared to pay out the butt... Just my 2 cents.

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HARRY304E

Do you think that a four lamp T-8 fixture would give enough light?

I am curious about why you would go with the T-8's instead of the T-5's?

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Dnkldorf

Plenty, the store is only 25x50. If he has 5 rows, I "assume" the rows run parallel with the short side of the store. (5) rows, each 15-18' long.

Come 3' off the wall, mount a fixture, 3 feet mount a fixture.


Stocking issues for one.

Performance, cost, and call backs for another.

HARRY304E

Thanks I did not know that the store was that small.




So the T-5 HO's have Performance issues?

So far "knock on wood" I have not had any call backs ,but my oldest install of this type of fixture is only about 3 years old.

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