I check the LUX output of a $3 flea bay 100w LED versus a $30 digikey 75w LED. With and without a colimating lens. Julian Ilett: https://www.youtube.com/user/julius256 Big Clive: https://www.youtube.com/user/bigclivedotcom/featured Mike's electric stuff: https://www.youtube.com/watch?v=H_XiunR-cAQ