Probably best to build your own for more space. The 14% might work but the 12% with a reflector might be best because it's more of a known quantity at this point. I haven't gotten a chance to test outputs or read test results for the 14% bulbs yet. Which fixture did you get? You can add reflectors after the fact on some of them (sunblaster comes to mind). It all really comes down to how far your main basking area will be from the bulb.