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SQM isn't subjective which I prefer, but depending on which part of the sky I point my SQM-L at I can get vastly different readings. There is a formula to convert SQM to NELM:
NELM=7.93-5*log(10^(4.316-(SQM/5))+1)
and one for NELM to SQM:
SQM = 21.58 - 5 log(10^(1.586-NELM/5)-1)
Last edited by mithrandir; 09-06-2014 at 10:31 AM.
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