Do any list members have access to metrology equipment that can be used to test the transmission characteristics of a few selected solar filters? I'd like to do some comparisons and demostrate quantifiably which wavelengths and what intensity these filters transmit. Any resulting publication will list the person doing the tests as co-author, if you like. I only have a broad-spectrum flux meter. I think we need a spectrophotometer for this. Please contact me if you can help me out. Thanks!