Our grow stores sell blue spectrum CFL's to use for supplement HPS for vegging if you only have one light. Might wanna try adding that. Also out home centers sell this frost wall insulating wrap that looks like silver bubble wrap. You can see it in my pictures. Concrete walls are great for soaking up heat which is handy for HID but killing your temps with LED. Might wanna put some of that on your concrete walls in your LED area to hold in heat.....but not sure on your set up.