How do lumens work--are they cumulative?

talley_sue_nycMay 13, 2013

My FIL made me a light fixture with 8 candelabra sockets (a friend of his who's a licensed electrician wired it for us).

He put 25-watt bulbs in it, each of them marked at 130 lumens. The package is labeled as "subtle, reassuring light."

The chart on the back says 1050-1999 lumens = "fresh, energizing light," but that's not what's going on here. Do the 130 lumens add up to 1,050?

Since there are 8 bulbs, I thought it might actually be TOO bright, but it's completely not. It's much dimmer than I like--maybe even dimmer than the 3-bulb fixture it replaced (though w/ 60-watt bulbs, it added up to 180 watts).

I'd have had him use normal-base bulbs, but he was nearly done before I knew what he was using, and I thought with 8 bulbs, it would be bright!

There are no shades; do you think I can switch to 40-watt bulbs? Do I need to do some sort of testing before I try it?

I'm not worried about it being too bright, aesthetically--I sew under that light fixutre, and I can't see well right now. I have a dimmer on that circuit that I can use the rest of the time. (I honestly think that reduces some of the brightness even when it's full on, because when the electrician put it in several years ago, substituting his brand for the one I'd pre-pursehd, the chandelier didn't seem to put out as much light.)

Thank you for reporting this comment. Undo

The short answer is yes. A fixture with lamps will be three times brighter than one with a single lamp.

Eight lamps at 130 lumens each would be roughly equivalent to a single 75w ordinary light bulb.

    Bookmark   May 13, 2013 at 8:48PM
Thank you for reporting this comment. Undo

wow, no wonder it seems dim! I was thinking maybe I was imagining things, but I don't think so. 75 watts is pretty dim for a 15x15 room.

Thanks for the help.

    Bookmark   May 13, 2013 at 10:08PM
Thank you for reporting this comment. Undo

Lumens from separate bulbs are not additive.10 100-lumen bulbs do not add up to 1000 lumens.

    Bookmark   May 28, 2013 at 12:19AM
Thank you for reporting this comment. Undo

Lumens are cumulative if they are shining on the same spot.

Getting them on the same spot is the problem without some type of aiming and focusing system.

    Bookmark   May 28, 2013 at 10:18AM
Sign Up to comment
More Discussions
Wireless light switch for switched outlet?
So we have no overhead lighting in any of our bedrooms,...
Can I electrify battery-operated lights?
Hi all. Is there a way to electrify a battery operated...
Goodbye Phone Jack: what to do with wires?
We want to remove this phone jack. It's in a useless...
Confused & need help please
I know just about zero when it comes to electricity....
Code changes
In outlining the electrical layout for our new home,...
Sponsored Products
Unique Ivory/Baby Blue Border Oushak Hand Knotted Wool 4'x18' Oriental Rug H5748
BH Sun Inc
Surya ESP30 Escape Area Rug - ESP3049-23
$117.60 | Hayneedle
Illinois Typography Personalized Canvas
$36.99 | zulily
Artehouse 2 Golden Retriever Wooden Wall Art - 20W x 14H in. - 0004-3044-26
$64.99 | Hayneedle
Halo Ceiling Fan with Light by Modern Fan Company
$384.00 | Lumens
Design House Hathaway Centerset Lavatory Faucet - 523365
$86.99 | Hayneedle
Zanz Wall Sconce by LBL Lighting
$236.00 | Lumens
Fusion Hourglass Weave Modular Bath Bar by Justice Design Group
$358.20 | Lumens
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™