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[APD] Co2 tubing and Light


New kid on the block...

two questions... I was catching up on this Co2 thing and tubing.. so what's this big deal about co2 resistant tubing??? and why the concern???

the second is... does anybody have an answer to this

I have been reading a lot about illumination and getting al kinds of info lux, lumens, PAR.
doesn't anybody have a standard metering scale???
when some one say Low light level or high light level... How many foot-candles is that???

any help would be great


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