Ok I am going to give this a go but I have a handfull of questions.

Does anyone have the Luxon MR16 3W light from superbrightleds working in the optronics light shell?
If so, What are you useing to limit current/voltage, and what are you using for heat sinking?

Those bulbs are $30 bucks a pop, is there a cheaper way to go about it?

How many batteries can you fit into a water bottle if you are making your own pack? batteryspace has a 10 pack of 5000mAh C sized NiMH w/tabs on sale for $30 right now. If i can build a pack that will fit in a water bottle that will be fantastic because I have a 2 hour each way commute and still have to figure out a taillight option. Almost exactly 2lbs for 5Ah is a fair trade for me for that price. I already have a Maha C777PLUS-II charger (which i hightly recomend to anyone who plays with batteries much) that could charge a 12v pack as a unit so if i had to cut the bottle open and reseal it to make the pack that would be fine.

Can any of you compaire just a single 3W luxeon to something else in terms of brightness? What sort of real word run times could I expect from a 5Ah NiMH setup with that and an led tail light of some sort?

$30 5ah 2lb battery pack
$15 light housing pair (only use 1)
$30 3W luxeon bulb (must be a cheaper option)
$20 LED tail light of some sort (looking for something 2-3" in dia that I can mount on a reflecer mount, suggestions?)
$10 switches and connectors
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$105, reasonable if I and up with a headlight at least as bright as a 10W halogen and a nice taillight that can hopefully make my 4 hour round trip on a single charge.
(+$60 for the charger but I already had that for RC toys)