'lil update: I did a little tinkering with resistors, but I got it up and going without them and wired up all 5 LEDs I had, since I had ordered a spare. It's not blinding bright, but it's a ton brighter than the old florescent bulb. I don't have a meter to tell you how much brighter, but after almost 2 weeks now, my plants are a lot happier and growing faster. Here's what it kinda looks like:
This was before wiring and while I still had 4 on the bar, but you get the idea. Drill 2 holes in the top of the hood, carriage bolts through the top, suspend an 1/8th inch thick aluminum bar with nuts on each side of the bar, thermal plaster on the LED's, wire it up and tuck the driver in back.
A blown LED was essentially what I was simulating when I had 4 wired, so if one blows, it'll just go back to blinking, possibly damage the remaining ones if I don't catch it soon enough, and it'll give my epileptic fish seizures.
More LED's would mean a custom hood, or suspended hood to spread them out more, and more money. This is at best a year long setup and trial run, but I see everyone's point. More LED's and a few blue ones would look better, but if I had more money to spare atm, I'd be building this thing into a sump for a bigger tank instead of trying to light it optimally. $40 total spent, still under the cost of a new hood and plant tube.
Thanks for all the advice though, I really do appreciate it and will use some of it when I start my big build.