lack of lighting on a patio set-up

[Sandy4453]

Advice is direly needed. My orchids are kept on shelving units on my patio, screened and facing north/east. I definitely need to get more lighting to the orchids especially, the Catts (about 20) now that the sun has shifted and hardly get any bright light there in winter, but I know nothing about what to provide for them except, fluorescent lighting. I can't install lighting in the units, above the orchids because, being on a patio where weather conditions can interfere, would be dangerous...lot's of rain here in Fla. Would it be defeating to assume that a floor lamp with regular light bulbs would help enough? Does anyone know of floor lamps with fluorescent lights and which in particular I need to get?

Thanks and apologies for not searching this forum more in depth than I have where, maybe the answer already lies....