Registered: Dec 2010
Location: Georgetown, Ohio.
Posts: 1928

i see some led light companys saying so many luxs and others saying so many lums or lumen
can some one brake this down for me?
what ever happened to good ol candle power like the use to rate them.....

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Phone # 937-213-1779

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Registered: May 2007
Location: Idaho
Posts: 407

To. I wonder same thing . Sence we whent to LED every thing changed

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Great hound hunters of the past quotes I like and live buy .
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Registered: Dec 2003
Location: Eclectic Alabama
Posts: 131

Here's a pretty technicale answer. My understanding of how bright an object is lit has more than one thing to consider not just lumen and candle power but beam focus also. Hey and I'm not as smart as the fellow that wrote this! I just copied it! I think I understand the basics. Larry


*A LUMEN is a unit of measurement of light. It measures light much the same way.

Remember, a foot-candle is how bright the light is one foot away from the source.

A lumen is a way of measuring how much light gets to what you want to light!

A LUMEN is equal to one foot-candle falling on one square foot of area.

Candlepower is a way of measuring how much light is produced by a light bulb, LED or by striking an arc in a Carbon-Arc spotlight. Is it a measure of how much light falls upon an object some distance away? No. That's illuminance. Is it a measure of how well we see an object that is illuminated by that light source? No. That's something all together different, and we are not going there!

Nowadays we use the term CANDELA instead of candlepower. Candlepower, or CANDELA is a measure of how much light the bulb produces, measured at the bulb, rather than how much falls upon the thing you want to light up. Further confusing the matter is beam focus. That's how much candlepower can be focused using a reflector/lens assembly. Obviously, if you project all your light bulbs intensity at a given spot, or towards something, it will be more intense, and the illuminance will be higher.

And here comes the confuser! A candlepower as a unit of measure is not the same as a foot-candle. A candlepower is a measurement of the light at the source, not at the object you light up.

And a candela is the metric equivalent of the light output of that one candle, based on metric calculations. And since using a candle is rather imprecise, the definition was amended to replace a light source using carbon filaments with a very specific light source, see the following:
The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.

*Candlepower is a measure of light taken at the source-not at the target. Foot-candles tell us how much of that light is directed at an object we want to illuminate.

*LUX is an abbreviation for Lumens per square meter.
Foot-candles equal the amount of Lumens per square feet of area.

So, that one candlepower equivalent equals 12.57 lumens.

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Last edited by Countryal on 12-26-2010 at 01:42 AM

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Registered: Dec 2010
Location: Georgetown, Ohio.
Posts: 1928

WOW........
so what is brighter 1000 lumen or 25000 lux ?

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it's nice to have a tree dog but the name of the game is to have a coon in the tree.
🐕
Doug Terrell
Phone # 937-213-1779

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Registered: Dec 2003
Location: Eclectic Alabama
Posts: 131

It's hard to say. If all things are equal I'd say the 25000 but If the 1000 has a better focus then it would be brighter and there could also be a difference in the brightness at certain distances. I have a good friend that's a lot smarter than I am and he finally gave up and said the best thing to do is compare the lights side by side and shinning at the same distance. But like I said you could have a light that is brighter at 100ft than the one next to it but then the one next to the 100ft could be brighter at 50ft. It's according to the focus. It's a confusing mess!

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Registered: Feb 2006
Location: Bloomfield Iowa
Posts: 924

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