Inquiry (采购产品): lumens I have a specific question about lumen levels for outdoor electronic visual display and other forms of electronic reader boards. I would like to know what the recommended levels are for nighttime vs. daytime brightness. Most cities mark a threshold of 1,700 - 3,000 lumens. Can lumens be measured from an outside source or instrument for example, in a similiar way that sound can be measured by a decibel meter? **** Hidden Message ***** Michelle Calvert 97526 Company: city government - Grants Pass, OR E-mail: mcalvert@ci.grant-pass.or.us **** Hidden Message ***** mcalvert@ci.grant-pass.or.us
