May be there an ambient light cap on i1 is needed. Or key '-a' use is invalid. > > Amin Gharehchaie wrote: > > > I am trying to measure the ambient light of my table light and spotread -a > > -s -H gives me a > > Lux value of 12000 > > > > While Eye-one share gives from the same spot 3000 lux > > I'll look into it. > > Graeme Gill. >