I don't think its that simple. "Any green light" including a "party bulb" from walmart just doesn't seem right. Using this logic it would follow that I could take a white bulb and my daughter's green washable crayola marker (any green as there are 6 or 8 of them) and color in the whole bulb. Essentially, the "party bulb" is a normal incandescent bulb with green glass, but the filament of the bulb still burns with the same properties as the white or clear bulb. Granted, ganja uses part of the red spectrum and part of the blue spectrum of white light to do its thing, but are we sure that the green glass is an efficient filter for these parts of the spectrum? Any green? I'm not so sure. I would be a bit more careful about what bulb you buy in terms of color temp and the other bulb-specific technical specs.

For example, I could trust a green LED, because LEDs are tuned to a certain part of the spectrum measured in nanometers...

My point is, unless you have enough specific info on the green bulb to trust it scientifically, I wouldn't use it. I believe in the purity of light and dark in indoor gardening.