I can't argue with your results but would advise that you not count on the christmas tree bulb's red paint maintaining its transmissive characteristics long term; do retest for fogging from time to time.
Originally Posted by dpurdy
As far as brightness, the red OptiLed puts out 45 lumens over a 130-degree angle. I don't know how many lumens a red 7 watt christmas tree bulb provides, but a similar white 7 watt night light version
claims 35. The red paint must attenuate that quite a bit. I bounce one red OptiLed off the white ceiling of my roughly 6' x 8' bathroom when it's configured for printing. Things are comfortably bright, even for these aging eyes.