Question determining LED light levels

[SprintCC]

Quick generic LED strip light question (hopefully). I'm planning my lighting layout, going to be using LED utility lights, 4ft fixtures (don't know brand yet)

My question is about determining fixture output - when I last looked at this (with florescent lights) you took the output of the tube & multiplied it by the # of tubes per fixture for total fixture output

ex: (2500 lumen T8 bulb)x(2 bulbs per fixture) = 5000 lumen per fixture

Does this hold true for LEDs? Many are not replaceable tubes from what I see, but non-replaceable strips. I'd hate to order my lights & find out I'm only getting 1/2 the light level I was expecting.

Thanks
Chris

 

[cybrdyke]

I'd hate to order my lights & find out I'm only getting 1/2 the light level I was expecting.

That would ****.
What if I told you that that's what happens when you used the fluorescent formula:(2500 lumen T8 bulb)x(2 bulbs per fixture) = 5000 lumen per fixture ? You would only get about 3200 lumens, not 5000, because you have a ballast that doesn't produce 100 percent of the rated lumens, you have a fixture that doesn't allow all the light to come out of it, and you have lamps that diminish over time.
If you are trying to match the light output of one T8 lamp, your LED tube equivalent will be somewhere in the range of 1500 to 1800 lumens per lamp. Sounds weird, but it's true.
I'm not sure what you mean by "utility fixtures", but there is a couple of Sticky Threads at the top of the Lighting Forum here that will help you select a fixture and will also help you determine how to space them out. Remember, "you get what you pay for" is very true in LED-world.
Good luck,
CD