Yes, pay attention to the total current draw when you planning to use 6-8 LEDs in parallel and check that against the current ability of the used PS. Assuming you are using LED as indicator on the front pannel and if you use super bright LED (at least 3000 mcd), then ~2mA per LED is more than sufficient, that is what I usual do with my builds. 6-8 indicator LEDs would draw 12 - 16mA totally. But when you use a LED to light up the tube, then you need more current, 8-10mA is what I usual do (don't go up to 20mA -even that's on the LED's spec- that will shorten the life of the LED). For the later purpose, you can also look at much brighter LEDs @ 12.000 mcd or higher, but these are also more expensive.