Am making my cooling circuit a sealed system:
intake from the nearby window to get cool air into the box (will be also re-installing the glass in my reflector box to seal it up), then air gets pumped in the ducting I made today up and into the reflector box to cool the bulb as it gets sucked out via squirrel cage fan with the rest of the hot air before being exhausted back outside through the window (will have a window insert to seal it up as well).
And I'm adding an exhaust duct for the portable A/C, and an inlet port into the box for the cool air (if we ever even get any more hot days this "summer").
And, yes, it's as ugly as sin
.
But using scraps of cardboard, so it is what it is, and it is air tight so it has good airflow even with just the one fan in operation (the window fan is identical to the dual-fan in the pics, and the squirrel cage fan is a 265cfm unit).