Hi Jeff! Many folks have converted the florescent fixtures to LED's. You can buy LED bulbs that will directly replace the florescent but you still have to rewire the fixture. I chose to used the LED strips as you can see in the thread below.
As for the chalking, that's coming off the roof. You need to give it a good cleaning to get rid of that!
Good luck, happy trails, and God bless!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD