The Planted Tank Forum - View Single Post - DIY PAR meter, Yeah you heard me
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post #470 of (permalink) Old 01-15-2013, 05:23 AM
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Join Date: Dec 2005
Location: Sacramento, CA
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The ratio between PAR and Lux readings, for 6500-10000K fluorescent lights is more like 76 than 60. But, if you are measuring the light from a pink bulb, the sun, incandescent bulbs, etc. the ratio can be much different. Lux meters are very useful for rough measurements to see if a light fixture/bulb is going to work well for you, but they are not useful for actual research type measurements - determining how effective an actinic bulb is compared to a 6700K bulb, for example.

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