www.Hydrofarm.com has screw in flouressent bulbs for plants, they can be expensive, but, they claim to be able to grow any orchid under them. Also you mentioned tiny spots on the leaves of your Sherry baby that looks like it's been splashed or sprayed?, this seems to be normal for Sherry's, mine has them on all the leaves. It seems to be normal pattern coloration. under some types of grow lights they'll look purple!
The white film on the bark is probably fertilizer residue if it's crusty, you can do what most folks do, either ignore it until it's time to repot, or just repot, (but not until after the plant has finished blooming!!)...You can also try this tip....Soak the pot, plant roots, bark and all in tempid water & white vinegar & a small squirt of dish detergent, (1/2 cup vinegar per 1 gal h2o) Sink the pot in the water until you've covered the bark with the water. soak for aprox 45-60 minutes, then run tempid water through the pot & all over the bark until it's rinsed very very well! The vinegar water will disolve a light mineral residue. for severe deposits repot the plant immediately.