here is one that will give you a ball pack figure http://www.rapidtables.com/calc/light/lux-to-watt-calculator.htm. but since leds use a limited number of wavelength yo could just renormalize using the lumen curve to get a relative output http://www.carbonlighthouse.com/2014/02/13/683-lumens-per-watt/#prettyPhoto this explains lumens in a clear easy to understand form.Hmm, radiant power could be useful if the calculator can separately calculate each band of light as being it's own lux source. Seems like you'd need a special sensor to isolate the differing frequencies so they could be adjusted for their relevance in par or radiant power. Still though, lux based measurements are gonna be rough.
But you *can* use a simple lux meter to see differences in relative intensity across different samples. It can't be used to compare panels. I just use it to see how light intensity dissipates with distance and to see how reflective surfaces affect the growing space.
Do you have a link to any cool calculators? Now I wanna try it.
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