How many lights for a 30x40

[steve h]

how many t 12 8 ft lights with reflectors would light up a 30x40 with 13 ft ceilings ,ive got 12,electrican told me 8,dont want to do it twice,thanks,steve

 

[Dragster Racer]

I am planning on around 30 or so for my 40X40X15. I would really reconsider the T12 in favor of the T8's. T12's will not be availible forever, and are less efficient. I have been happy with the T8's I have tested. I like the daylight bulbs for more light though.

 

[steve h]

I agree , but i have 12 free t 12s so i waning to save a few bucks,steve

 

[ArthurPE]

a rule of thumb is 1W/sq ft...
but the more the better
strategically locate them...
focused work areas, more
open areas, less

total wattage ~ 12 x 2 x 80 ~ 1920
area ~ 30 x 40 ~ 1200
W/ft^2 ~ 1920/1200 ~ 1.6

I'ld go with the 12 fixtures...
4 rows of 3
rows 10' on center, 5' on the sides ~ 40'
each row, 2' between fixtures, 1' on each end ~30'

put 2 switched circuits in, alternate fixtures in the open areas, put all the work areas on the same circuit...

 

[steve h]

thanks all!

 

[jdkenyon]

In my 32x32 with 12' ceilings I have 8 8' HO fixtures. It is plenty bright but that is never a problem.

 

[steve h]

Got all 12 of my t12 8 ft lights up today and finaly got power to my shop,i am very pleased with the lighting ,this is my first shop so im excited about getting it ready,next is building the benches,steve