Ok hahaha i guess ill try some lower power stuff first. What power would you recommend?
I would likely just pickup several of the higher mcd 5mm white LEDs, you can always dim them... And once I got them I would try one, see how it work, then bundle two together and see how it goes, 3, 4, 5 or even a bundle of 10...
And another thing to consider, say you find that 10, 100,000mcd 5mm leds work well, but the bundle of 10 is too large or you wish it was a little more but you are out of space, you can drop down and use 3mm LEDs at or near the same rating...
Once you get into those high flux ones (like you linked) you have to deal with the heat and the fact most want a constant current source... Not a huge obstacle but it would need to be addressed, and those LEDs are crazy bright...