Since you are not trying to bloom, propagate, or grow those plants, I wouldn't bother. But, if I did, I would use several clamp lights with these 8.5 watt warm white LED bulbs:

http://www.homedepot.com/p/Philips-60W-Equivalent-Soft-White-A19-LED-Light-Bulb-2-Pack-455576/205815532

I would position the lights slightly to the east and shine them at an angle, maybe, 60 degrees, onto the plants to avoid the fixtures blocking any daylight from the window. I would put them on a timer set for 16 hours.

Thank you for your suggestion. So I 'm a little confused about LED vs compact fluorescent. Don't the compact "cool white" fluorescents deliver more of the blue light needed for foliage plants? None of my plants bloom, so I was just wondering about difference. This light, for instance, delivers 4100 Kelvin. I thought the higher the Kelvin, the better. You probably know more than me--I'm just basing this on internet articles.

http://www.lightingsupply.com/50123-41k.aspx?utm_source=google&utm_term=&utm_campaign=Margin+Medium+High+PLAs&utm_medium=cpc&utm_content=qxXW1R0K|pcrid|74568390774|pkw||pmt||pdv|c|&gclid=CIu3zrKUmMcCFUIbgQodUDoAJQ

There is enough blue light from your window. Photosynthetic action curves typically peak at 660 nm which is in the red region. Most typically, fluorescents peak at 611 nm and have practically no light with wavelengths greater than 630 nm. The LED bulb that I recommended has a substantial amount of red around 660 nm. Since the human eye is less sensitive to 660 nm than 611 nm, at equal lumen ratings and color temperature, the LED bulb that I recommended is better than typical fluorescent for plants. For both LED and fluorescent, the green to red ratio is lowest for warm white therefore you will waste less electricity on green light by selecting warm white.

Besides, what do you expect will happen with all red light? Do you think that your golden pothos will be forced to bloom so much that it dies? I quarantine that it won't bloom.

Oh, I see. I am still learning about the difference in red vs blue, and how much plants need of each. There is so much differing information out there. Thanks for the explanation!