Not my video ! U refer led wizard guy , the above person ? And reading the lumens per watt from a specification sheet is not what u get when the LED is hot . Data sheets represent the output with a very low and unrealistic junction temperature . The MKR on the spectrum king LED 400 plus unit is capable of 200 lumens per what . but it ' s not what u get . Call CREE themselves and ask them if to achieve maximum lumens per watt you should use CXB OR high power LED like MKR , XHP , MHD and so on . The COB chips always have an uneven diode junction temperature because they share the same substrate . Don ' t get me wrong they are great for lowering cost and packing light in a tight space . <| sep |> Sej is a God . <| sep |> Not at all runs great