Hi. Attached is the pic o my gro box with 120 watt led light. I live in Canada so it I going to get cold where I h my cabinet grow. Would you make sense to add a 6500 CFL to get a bit o warmth an mor bud weight? I box is 29 inches wid. 20 inches deep deep 39 inches high.
They appear to be getting plenty of light, it is possible to overlight plants so I'd be careful. A CFL isn't going to add a huge amount of heat, either. Personally, I'm also a fan of what I have dubbed The Electric Blanket Sandwich, which I used whenever growing in my cold basement. Right under the tray. I'm not sure how that could work in your scenario though.