how many lights

[shadowrider509]

just built a 32x40 garage with 10 ft walls, going to put the 8 ft. 4 bulb fixtures from lowes up , but not sure how many i need. shop will be used mainly for woodworking.

 

[NHBandit]

Tagged. Looking for the same info myself.

 

[Steevo]

I used 17 of them in my 24x40 with 12' ceilings:

 

[Phabask]

I used 8 T5 6 lamp fixtures, shop size is 28x32,

 

[dmw56]

As many as you can. I'd put in at least 4 rows.
I have 4 rows X 4 8' lights in my 40'X40'.

 

[Modifieddriver]

I used 17 of them in my 24x40 with 12' ceilings:

I'm slightly confused on the number.

Let's try this: What is the total # of bulbs used to make that shop look brighter than daylight???

When we talk about # of fixtures, it gets confusing because we have 2,4,6, & 8 bulb fixtures.

Again, are you using T8's or T5's?

I'm about ready to buy about 20 4 & 6 bulb HB WB T5HO fixtures, so what you've done is a gauge for me. Are you too bright or just right?

 

[sed6]

I can see 29 fixtures there. Each with two 8 foot bulbs. T8's with electronic ballasts for cold starting and no hum are the way to go.

 

[Modifieddriver]

I can see 29 fixtures there. Each with two 8 foot bulbs. T8's with electronic ballasts for cold starting and no hum are the way to go.

Yeah, I count 7 in one row, but that doesn't make sense. 8' x 7 = 56'.

He said his shop was 40'(?) long? Doesn't compute ??

 

[Steevo]

Mine are 8-foot fixtures, each has four 4' T8 tubes.
The three center rows are 4 fixtures each, then two in the far row, with a gap between them where the bathroom is, and above where the picture was shot from there are three, in an L-shape, around the corner, above my workbench.
68 tubes total.

Lighting is just right for working.

 

[dimarcelli]

I count 16. 2-4-4-4-2 from left to right.

edit: yup 17 was hiding i had a feeling.

 

[NHBandit]

Mine are 8-foot fixtures, each has four 4' T8 tubes.
The three center rows are 4 fixtures each, then two in the far row, with a gap between them where the bathroom is, and above where the picture was shot from there are three, in an L-shape, around the corner, above my workbench.
68 tubes total.

Lighting is just right for working.

No wonder you had to photoshop those Ray Charles glasses onto your pic...

 

[Modifieddriver]

Mine are 8-foot fixtures, each has four 4' T8 tubes.
The three center rows are 4 fixtures each, then two in the far row, with a gap between them where the bathroom is, and above where the picture was shot from there are three, in an L-shape, around the corner, above my workbench.
68 tubes total.

Lighting is just right for working.

Using your info for the lights a size of the shop, and doing a SWAG, you are at about 130 Foot Candles.

That's more than my charts shows for a body shop, which is 80-120 FC.

You can do some fine work in there. COOOOOL

 

[Steevo]

68 tubes at 2800 lumens ea = 190,400 lumens
190,400 / 960 (sq ft) = 198 lumens/sq/ft

 

[40cpe]

For reference, this is twelve 8 ft-4 bulb fixtures in a 30' x 40' mounted 12' and 14' above the floor. This is 120 lumens sq/ft compared to Steevo's 198 lumens sq/ft.

 

[Modifieddriver]

For reference, this is twelve 8 ft-4 bulb fixtures in a 30' x 40' mounted 12' and 14' above the floor. This is 120 lumens sq/ft compared to Steevo's 198 lumens sq/ft.

Are those T8 or T5 bulbs ? You have 48 bulbs for 1,200 sq.ft.

I'm looking at 84 54watt T5 bulbs for 2,400 sq.ft. That's 130FC. I don't know how that translates to Lumens? Each lamp puts out 4,450 Lumens.

So, would this be 156 Lumens?

My other shop is 34'x48'x10'. That's 1632 sq.ft. Looking at installing 64 54w T5 bulbs. That computes to 145FC. Each lamp is 4,500 Lumens.

So, would this be 176 Lumens? If so, I guess I could back off on the number of bulbs.

Not sure how to calculate Lumens .

 

[40cpe]

my lights are T8, total of forty eight 32 watt bulbs rated at 3000 lumens each.

Calculate lumens by (number of bulbs x lumens per bulb divided by sq ft.)

 

[Modifieddriver]

my lights are T8, total of forty eight 32 watt bulbs rated at 3000 lumens each.

Calculate lumens by (number of bulbs x lumens per bulb divided by sq ft.)

Thanks . I thought that's the way it was done, but wasn't sure. I did my calculations that way.

 

[Steevo]

Are those T8 or T5 bulbs ? You have 48 bulbs for 1,200 sq.ft.

I'm looking at 84 54watt T5 bulbs for 2,400 sq.ft. That's 130FC. I don't know how that translates to Lumens? Each lamp puts out 4,450 Lumens.

So, would this be 156 Lumens?

My other shop is 34'x48'x10'. That's 1632 sq.ft. Looking at installing 64 54w T5 bulbs. That computes to 145FC. Each lamp is 4,500 Lumens.

So, would this be 176 Lumens? If so, I guess I could back off on the number of bulbs.

Not sure how to calculate Lumens .

Don't back off.
176 is good working light.

 

[carcruse]

just built a 32x40 garage with 10 ft walls, going to put the 8 ft. 4 bulb fixtures from lowes up , but not sure how many i need. shop will be used mainly for woodworking.

Put your #'s here:

http://www.visual-3d.com/tools/interior/default.aspx?id=15170

I get 12 for your case at 90fc

 

[Tamper84]

Put your #'s here:

http://www.visual-3d.com/tools/interior/default.aspx?id=15170

I get 12 for your case at 90fc

Thank you for this!!!! I have been looking for something like this for a while!!!
Just out of couriousity how you do calculate fc? Also what is a good number to shoot for?


Thank You,
Chris

 

[Blk88GT]

I put 40 tandem strip 8' fixtures in my 40x50.

160 T8 lamps total...

 

[carcruse]

Thank you for this!!!! I have been looking for something like this for a while!!!
Just out of couriousity how you do calculate fc? Also what is a good number to shoot for?


Thank You,
Chris

Try this:

http://www.ncat.org/energy/images/IES footcandles.pdf

 

[Tamper84]

Try this:

http://www.ncat.org/energy/images/IES footcandles.pdf

Thank you very much!!!!! One more dumb question. Once I get lumens per square feet, how do I convert that to fc?

Chris

 

[carcruse]

Thank you very much!!!!! One more dumb question. Once I get lumens per square feet, how do I convert that to fc?

Chris

http://www.unitconversion.org/unit_converter/illumination.html

 

[Steevo]

Thank you very much!!!!! One more dumb question. Once I get lumens per square feet, how do I convert that to fc?

Chris

They are the same