Got it.
I suppose then blue must be a bit better than the red. Obviously a CHE would be the move when you can afford it, but for now I would go with blue light. What kind of enclosure do you have? Is it possible that there is too much ventilation from either an AC, fan, etc.? I have had issues keeping temps up at night but the lowest I've dealt with is the 75-78 range so nothing too terrible. Please keep me updated on what you decide to do! Best of luck bringing the temps up at night!