I can't say whether or not those conversion factors are accurate, but I can say that we will never know the light intensity with any more accuracy than about +/- 10-20%. And, that is being generous. So, assuming those numbers are correct, you can just divide the lux by 50 to get PAR (micromols per square meter per second), no matter what type of lighting you are using.
Always remember that a PAR or lux number has to be associated with a distance from the light, because all light intensity from all sources drops with the square of the distance from the source. This means you can't specify a light as a 100 lux light, for example. It could only be a 100 lux at 10 feet light, which would be a 316 lux at 1 foot light. This also means that you can't accurately say that your tank is lighted at 100 PAR unless you say at what level in the tank that 100 is measured - substrate level, mid tank level, water surface level, substrate at the front glass level, etc.
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10-21-2009, 05:09 PM
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