So this is kind of a science-y question. What's the difference between the t8 bulbs from home Depot that are 2 for $8 and the bulbs at the LFS that are like $20? I mean since I can buy bulbs that are 5k kelvin for cheaper, wouldn't it make sense to always get those? I have a planted 75 and 30. I haven't ever run the LFS bulbs in either because when I bought the 75 the bulbs in there were old and when we were kids with our old 75 we bought the home Depot bulbs, the only difference was it wasn't planted. With the 30 I just set it up and I'm sure the bulb is old as I got it from a friend who had the tank for a while before passing away. I'm just trying to figure this one out with ya'lls help. Thanks!!!!!