Lumens per square foot

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Sean_Carb

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Through my research online, I have discovered that 75 lumens per square foot are required in bathrooms. Where does this requirement come from?? I need to back be able to back it up with a code from whatever source it originates from. Does anyone have an idea?
 
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Sean_Carb

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Sean_Carb said:
Through my research online, I have discovered that 75 lumens per square foot are required in bathrooms. Where does this requirement come from?? I need to back be able to back it up with a code from whatever source it originates from. Does anyone have an idea?
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Sorry for the typo. "I need to be able to back it up with a code from whatever source it originates from."
 
david luchini

david luchini

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Connecticut
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Engineer
I don't think you'll find any "requirement" for 75 lumens/sf in bathrooms, in any code or standard. (I can't tell if you're referring to footcandles or to the quantitiy of lamp lumens installed in a specific size room.)

I think (can't put my hands on it) that IES recommendations are closer to 20 FC in restrooms for commercial applications.

I believe the International Building Code has a requirement of 10FC at 30"AFF, and the International Residential Code has a requirement of 6FC at 30"AFF, generally.
 
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Sean_Carb

Member
david luchini said:
I don't think you'll find any "requirement" for 75 lumens/sf in bathrooms, in any code or standard. (I can't tell if you're referring to footcandles or to the quantitiy of lamp lumens installed in a specific size room.)

I think (can't put my hands on it) that IES recommendations are closer to 20 FC in restrooms for commercial applications.

I believe the International Building Code has a requirement of 10FC at 30"AFF, and the International Residential Code has a requirement of 6FC at 30"AFF, generally.
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Thanks David. Question for you... In regards to the IES recommendation you referred to, is that spelled out in the IES handbook specifically? Or is that figure the result of calculations? If it is spelled out in the IES handbook, under what article? I am unable to find anything in the handbook that is a direct recommendation or requirement, only outlines and figures for calcs.
 
beanland

beanland

Senior Member
Location
Vancouver, WA
No Requirements, Only Recommendations

No Requirements, Only Recommendations

IESNA makes recommendations. There are no accepted standards for minimum or maximum light levels. Many states (OR) have light power level limits (e.g. 1w/sqft) which establishes a defacto maximum light level.
 
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