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Lighting for 32 x 44: Does this sound right?

VeemanOH

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Joined
Aug 21, 2017
Messages
16
All,

I had another thread going a few weeks ago, but with the building almost done, I set about doing some lighting layouts.

Facts:
- The finished space is 32' x 44' x 12' with ribbed white (satin) metal sheeting on walls and ceiling (mounted to scissor trusses).
- Concrete floor.
- The two garage doors are on one of the 32' ends.
- There are three small windows (24") at 8 feet on one 44' side and three larger (4 ft) windows on the other wall.
- Work space will be at opposite end as the garage doors and can be supplemented by extra work area lights.
- This space will be used for weekend warrior type car projects. Racing efforts and restoring / tinkering.

I did check the lighting layout thread but got somewhat lost in there. My plans are inspired by some of them, but If anyone knows of a post to check that's more similar, let me know.

Anyway, based on internet research and what Platonic Solid has said, I believe we should be aiming for around 90 foot candle at 30". I calculated that I'll need around 127,000 lumens to make this possible.

For spacing, one site said that fixtures shouldn't be more than 13.5 feet apart and that I should aim to put the fixtures around 4-7 feet from the sidewalls.

My first question is, does the white ceiling and walls help cut down on the lumens that I'll need from the lights since less is lost?

Next, I spied some 8 foot LED fixtures (Metalux -8400 lumens) at the big box store and used that as a starting point. In the drawings below, that's what's shown. The circle is a 60" ceiling fan (planned). The blue dotted horizontal lines are the trusses.

With 9 lights, it seems I'd have around 76k lumens
With 12 lights, I'm around 100k lumens

Does this seem reasonable / right? I know it's my choice, but I want to do it right the first time...

The electrician thinks I'm absolutely nuts to add that many fixtures. Can anyone help me load this into Dialux (or send me at least the building object layout) so I can play with it?
 

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Hivolts

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Feb 13, 2016
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Yes less light will be lost with white ceiling and walls.

I believe 9 will be more than sufficient. I would make sure they're at least 4000K fixtures. Doing the math you have 1408 sq ft total. 9 fixtures will get you 53 lumens a sq ft. I have 39 lumens a sq ft in mine and its more than sufficient. I use mine for auto work, detailing, etc. Way more than enough. Under the hood I'll use a drop light anyway.

Hope this helps.
 
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VeemanOH

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Aug 21, 2017
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Yes, thanks! The fixtures I saw were 4k in color and had a CRI of 80. Efficacy of 107 lumens per watt.
 
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VeemanOH

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Aug 21, 2017
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Anyone else have input on these layouts? I'll probably need to get the lights here soon... Thanks!
 

cybrdyke

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Sep 9, 2014
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Anyone else have input on these layouts? I'll probably need to get the lights here soon... Thanks!

The internet has led you astray. From a quick glance, you're going to be well below your targets.
You cant use lumens per square foot as a measurement of foot candles and it looks like that's where you went wrong. You really need to get a layout done just to make sure.
Good luck,
CD
 

kd3pc

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I would use 16, closer on the ends and put half on one switch and the other half on another switch.
 
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