There is some truth to Windy's statement but it goes much farther. When I worked at a large commercial printing plant, all the presses had a viewing booth. The table was at a certain angle and there was an 8 tube fluorescent fixture above that was tilted at an angle to match. I can't remember the type of tubes, but I think they were a CW-50 and CW-75? They were alternated in the fixture which had a multi-switch that could allow you to have all of them on, or just the 50's, or just the 75's. It had to do with how much red and blue light they put out, or something like that. I didn't get too much into the science of it, just kept the fixtures in good repair and the proper good tubes in them.
I started a thread earlier this year about having all of the fluorescent tubes and fixtures start to die in my garage at the same time! About the same time, where I work now, I was given some LED tubes to update the 48" fixtures over one of our 18 head embroidery machines. I read the instructions that came with them, and saw that all they needed was 110VAC supplied to one end of the tube! Take out the ballasts and wire input power to each pin on one end. All the starters and ballasts needed are in the tube. makes the fixtures a ton lighter, easier to handle and hang. I forget the wattage, or lumins or what ever the rating were, I just knew that I liked them! I checked into various sources on the net and it turns out on of the largest internet lighting stores, "Super Brite LED's" is right near me. I got a on line coupon somehow, and then counted up how many fluorescent tubes were in my house, and ordered up that many. I changed out all the tubes in my garage and was even able to leave out one fixture because I just didn't need it now. I'll change the others as they start to die off. The big thing I like about the LED tubes is that the come on INSTANTLY!, are supposed to last 50.000 hours, and are not affected by cold temps like fluorescent lights are Search that subject out and see what else I passed on, I've slept since then and can't remember.
Type at you later,
Dan McEntee