Two (weird) newbie questions concerning lighting.

[quietmorning]

Hi, everyone -

We're in the process of planning the lighting needs for the future orchids in a very dark old home. I was discussing some possibilities with my husband, and well, both of us are clueless as to whether they would work or not.

So here they are:

1. After the bathroom is completed, there is a light on one wall above a mirror with a shelf. This wall is bookended by two windows, the only two windows in the room.



We use fluorescent lamps in the house already, but was thinking about making this specific lamp into a plant light for the mini I plan to put under it. Do they make plant lights that would fit a common household fixture? And if they do, would the common household usage of a bathroom light (on and off during the day - mostly off, and on for several hours at night) be enough or harmful (with the off hours) for an orchid? Or should I leave the light on during the day and change out the bulb for night use? (or unscrew it so that it does not come on)
We have an overhead light and will have a three lamp light over the medicine cabinet on the side wall.

2. With the natural way the sun rises, moves across the sky and sets - would it be reasonable for a set up of lighting to mimic the sun's changing intensity during the day? Would the orchids even notice? (If it could be done?)

Thanks!