LED troffer replacing fluorescent troffers

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Stevenfyeager

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electrical contractor
What LED troffers (2x4 foot) do you recommend for replacing fluorescent 4 bulb T8 -lay in troffers in an office Buiding or store ? 39 watt? 51 watt? What brand? Thank you
 
Stevenfyeager said:
What LED troffers (2x4 foot) do you recommend for replacing fluorescent 4 bulb T8 -lay in troffers in an office Buiding or store ? 39 watt? 51 watt? What brand? Thank you
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What I am wondering is the odd specification. Generally you choose requirements and capabilities, then you look around the requirements. You don't build around products with the exception of when you're sitting on fixtures already acquired by someone else.

What are you trying to accomplish? How old are existing fixtures? Are they at end of life?
 
Electric-Light said:
What I am wondering is the odd specification. Generally you choose requirements and capabilities, then you look around the requirements. You don't build around products with the exception of when you're sitting on fixtures already acquired by someone else.

What are you trying to accomplish? How old are existing fixtures? Are they at end of life?
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they
were non working T 12 fixtures, and the customer is allowing me to replace them with LED's My local Elec supply has the two options... I am checking with other suppliers now. thank you
 
Stevenfyeager said:
What LED troffers (2x4 foot) do you recommend for replacing fluorescent 4 bulb T8 -lay in troffers in an office Buiding or store ? 39 watt? 51 watt? What brand? Thank you
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cpinetree said:
We have been using a Cree ZR24-40L-40K-10V
spec sheet: http://api.icentera.com/v2/getfile.aspx?f=32D53E0BDCF98597D94494ACE0F791186CE84267B962F58C57B3D21D7FBCD8BC6139C8B76617A7CF

It's a 44 watt 4000k, fairly reasonable pricing.
The few we have done everyone (tenants + owners + us) like them.
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But it's pretty easy to use "we like them" to gloss over inadequacy and not meet spec req, customary design standards or regulatory requirements and this is too common when ESCO sales reps are allowed to make decisions.

4x2 fixture are available in 2, 3, or 4 lamp. 4000 lumen class LED fixtures are only meant to play alongside RE70 T8 two lamp fixtures with 59w input. LEDs lumens are stated in brand new owing to their extremely high deterioration during their lifetime.

This was published in 1993, but it is still usefully valid. These days, T8 lamp life is longer and even back then they last nearly 40,0000 hrs for around the clock operation. ( http://www.lrc.rpi.edu/programs/NLPIP/lightinganswers/pdf/view/LAT8.pdf )Special long life lamps known as double life lamps today last twice as long as the standard offerings. Four 34W lamp fixtures (which is the norm for T12 systems still in service) with magnetic ballasts have a typical input of 137w (same source).

With laboratory measured average delivery efficiency of 72% ( http://www.pnl.gov/main/publications/external/technical_reports/PNNL-18076.pdf ) and using, the delivery lumen goal for 4 lamp F34T12 troffer replacement is about 7,500 Lm which can be done with 80-90W with 3 or 4 lamp HPT8 option and fixtures or retrofits kit that are more thoughtful of utilization efficiency. Greater watt reduction is possible if the target is matching the existing aged luminaire conditions. Since this is an office building 25 and 28W HPT8 lamps are usable.

LEDs aren't as efficient as you may think in case you did not realize.

MattS87 said:
We have been installing the EvoKits from phillips. Done about 100 so far and they are fairly easy. Plus they have 2 drivers so you can hook only 1 up for a dimmer light or both for full brightness

https://www.platt.com/platt-electri...L-39W-835-2-0-10-7-G2/product.aspx?zpid=90573
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That's a 4,000 lumen class.
 
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