Integrating sphere for measuring lamp luminance.
https://diqn32j8nouaz.cloudfront.net...y_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...1_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...941#post206924
https://www.homemadetools.net/forum/...850#post206601
https://www.homemadetools.net/forum/...017#post187414
https://www.homemadetools.net/forum/...741#post163461
https://www.homemadetools.net/forum/...931#post171597
