@mow said , My tank will be a 4 footer. It will be high tech and I need to hang the light high above the tank potentially. At least 60cm above the tank. My plan is to use 45 degree lenses.
I am also up to the challenge of such a build but I need it to be very neat like yours as it will be a display tank. I am very finicky with colour rendition and don't know exactly what I like. I think I will like a purple tinted crisp white look. Probably more heavy on the blues.
Dimensions in cm h/w/l please