Why not do what a lot of people on here do, DIY a reflector outta some cardboard and foil? Something can't be worse than nothing, right? And if you don't know that a box would make too much heat, why not try it out and find out for sure?? I'm not trying to be a dick, I've for sure seen one of your previous attempts, and it seems like you have everything to make it work, it just doesn't work, know what I'm sayin? Also remember, you get what you put into it. Just don't give up, try some new ideas, and good luck.