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Thread: LED-How to tell the real ligthing output of led lights?How to compare lighting power?

  1. #1

    Default LED-How to tell the real ligthing output of led lights?How to compare lighting power?

    I am looking at several led light options. Obviously, one of the considerations is how much light the led panel emits.
    Some companies list their products specifying out put via "lux"
    Others list Watt, W.
    Others use lumens...

    My questions: How to measure/compare the lighting output of led lights? Is there a way to convert these numbers? All I want to know how much light these lights output so I can compare them.

  2. #2
    Join Date
    Feb 2006
    Surrey, UK
    Blog Entries


    There's a great explanation here:
    Here's a key extract:
    Achieving an illuminance of 500 lux might be possible in a
    home kitchen with a single fluorescent light fixture with an
    output of 1200 lumens. To light a factory floor with dozens of
    times the area of the kitchen would require dozens of such
    fixtures. Thus, lighting a larger area with the same number of lux
    requires a larger number of lumens.
    The difference between the lux and the lumen is that the lux
    takes into account the area over which the luminous flux is
    spread. 1000 lumens, concentrated into an area of one square
    metre, lights up that square metre with an illuminance of 1000
    lux. The same 1000 lumens, spread out over ten square metres,
    produces a dimmer illuminance of only 100 lux.

    Watts is nothing to do with light emitted, but is how much power is consumed. Some lights (especially all the new "eco" bulbs we buy in Homebase, state an "equivalent wattage". What that means when something says "equivalent to 108W" is it produces a similar amount of light (lumens in the paragraph above) as a tungsten (old fashioned) 108W light bulb might have produced.

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