I made holder for Sinkor LED WRB 75 25W. Thickness of fish tank wall 5mm. The thickness of the LED light is 8 mm and the width is 80 mm. Distnace between fish tank and LED Light is 28 mm.

Led Light:https://www.invitalshop.sk/sinkor-led-wrb-75-osvetlenie-akvaria-75cm-25w?gad_source=1&gclid=CjwKCAiA9ourBhAVEiwA3L5RFgUm6SaMASpaV_lQinBTwgtg18zzcgt8pYdXFKeH2fcxy21lwIBPrhoCpXIQAvD_BwE

Enjoy