akpolaris
Well-known member
How does watts convert to lumens. If I want 100 lumens per sq ft how many watts is that equal?
watts = lumens
- Thread starter akpolaris
- Start date
alfredeneuman
Well-known member
There's no set watts to lumens ratio
It all depends on how efficient the light source is.
LED for example has a much higher efficiency than incandescent.
It all depends on how efficient the light source is.
LED for example has a much higher efficiency than incandescent.
BillK
Well-known member
ak,
If your shop is 32x32, that is 1024 sq ft. If you want 100 lumens per sq ft, you will need 102,400 lumens. Then you need to figure out what type of bulbs you are going to use and then you can figure out how many bulbs you need. I was looking at 6 tube T-8 fixtures the other day and I think they were around 18,000 lumens for each fixture. In your case you would divide 102,400 by 18,000 and get 5.68 so you would need 6 of those fixtures.
Does that help ?
If your shop is 32x32, that is 1024 sq ft. If you want 100 lumens per sq ft, you will need 102,400 lumens. Then you need to figure out what type of bulbs you are going to use and then you can figure out how many bulbs you need. I was looking at 6 tube T-8 fixtures the other day and I think they were around 18,000 lumens for each fixture. In your case you would divide 102,400 by 18,000 and get 5.68 so you would need 6 of those fixtures.
Does that help ?
Dick in Wisconsin
Well-known member
Is 100 lumens/sf adequate for a shop?
BillK
Well-known member
****,
I think it should be. My shop is 1800 sq ft with 14ft ceilings and it has 6 2-tube 8ft T-12 fixtures. The T-12 bulbs are around 5000 lumens each so I have about 60,000 lumens for 1800 sq ft .... about 33 lumens per sq ft. It is workable with some task lighting but definitely needs to be brighter. I am looking at replacing the T-12 fixtures with 6 tube 4ft t-8s, about 18000 lumens per fixture. That is going to almost double the light to 60 lumens per sq ft. and should be more than enough.
My walls are painted white which makes a big difference too.
strelnik
Well-known member
My shop is 2100 square feet and has 8 each four-bulb fixtures with T-8 bulbs.
You can operate in there.
You can operate in there.
laser3kw
Well-known member
In my 30 x 40, I just installed 30 4ft t8 bulbs. The lights are above the 30 x 24 "work area" which has a 10ft ceiling. All walls and ceiling are painted white for best reflection. PLENTY of light
The lights are in 3rows- each row = 2, 8ft 4 bulb tandem fixtures and a 4ft 2 bulb fixture - 20ft total. == = == (bulb lay out per row)
The lights are in 3rows- each row = 2, 8ft 4 bulb tandem fixtures and a 4ft 2 bulb fixture - 20ft total. == = == (bulb lay out per row)
BillK
Well-known member
That makes me feel better about my plans. You have 32 bulbs for 2100 sq ft and I will have 36 bulbs for 1800 ft
CADPoint
Well-known member
http://www.visual-3d.com/tools/interior/Default.aspx?id=14783
Go play with your layout and see what your lights will give you.
Most people don't understand that most illumination presents itself
as a bubble of light and not as a complete spray of light.
One can note this on the bottom right of the web page of the light that you choose.
Below is what OSHA has set up as the minimum of lighting requirements for
various spaces.
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10630
Go play with your layout and see what your lights will give you.
Most people don't understand that most illumination presents itself
as a bubble of light and not as a complete spray of light.
One can note this on the bottom right of the web page of the light that you choose.
Below is what OSHA has set up as the minimum of lighting requirements for
various spaces.
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10630
LS6 Tommy
Well-known member
I don't mess with lighting enough to know the ratings/formulas/conversions, but the guys at plantedtank.net pretty much go crazy over the various "how much light for *** gallons/** inches of water depth" discussions. The ones deemed to be the lighting geniuses say it's now about PAR ratings. Lumens is "old tech" and watt rating questions send them right off the edge...
Tommy
Tommy