<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Artie Choke:
1 lm/m2 (lumens per square meter)
= 1 lux (lx)
= 10-4 lm/cm2
= 10-4 phot (ph)
= 9.290 x 10-2 lm/ft2
= 9.290 x 10-2 foot-candles (fc)
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For illuminance measurements:
To obtain footcandles (lumens per square foot), multiply the lux reading by 0.0929, or the phot reading by 929.
To obtain lux (lumens per square meter), multiply footcandles by 10.76, or phot by 10,000.
To obtain phot (lumens per square centimeter), multiply footcandles by 0.00108 or lux by 0.0001.
There are also other measurement units with names like blondel, candela, footlambert, millilambert, nit, and stilb. I have a conversion chart for all of these in relation to one another, but I don't know how to do tables which would be necessary in order to post it on the web.
Maybe I'll just try to take a picture of the thing.