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@deleted
http://en.wikipedia.org/wiki/Lumen_(unit)
According to ^ that:
Lumens (a luminous flux measurement) measure the varying sensitivity of the eye to diff wavelengths of light i.e total amount of viisble light from a source.
It's radiant flux (watts) that tell you how powerful the light is.
Lux is probably the better measure as it takes into account the area that the lumens are spread over. You can have 1000 lumens spread over either 1 or 10 square metres, which is 1000 lux and 100 lux respectively. 1000 lux would be brighter than 100 lux.
sorry.