Looks like you are about right...
From a comment of TFA -
"Great start, not quite there yet (12/10/08 - 16:41 - by Robert B.)
The manufacturer\'s data sheet states 15 minutes output at 270 lumens
on high (67 lumen-hrs), or 60 minutes at 90 lumens on low (90
lumen-hrs).
From this, I\'d estimate that on low the device draws
approximately 1 watt from the ultracap, with each LED each operating
at 0.3 watt at around 100 lumens per watt, with roughly 90% DC-DC
converter efficiency.
This is 1 watt-hour from the ultracap.
On high, this device would draw about 4 watts from the ultracap,
with a little over 1 watt reaching each LED, given a slightly lower
LED efficiency at the higher brightness and a significantly lower
converter efficiency, possibly a bit over 75%.
Compare this with
two AA NiMH cells (at 3 watt-hours each) that together store 6
watt-hours.
Ultracaps are a breakthrough technology, but the
energy storage density is still pretty low, as we see here. It will be
a few years before ultracaps become the most satisfactory overall
choice for flashlights."
Slashdot Mirror
Looks like you are about right... From a comment of TFA - "Great start, not quite there yet (12/10/08 - 16:41 - by Robert B.) The manufacturer\'s data sheet states 15 minutes output at 270 lumens on high (67 lumen-hrs), or 60 minutes at 90 lumens on low (90 lumen-hrs). From this, I\'d estimate that on low the device draws approximately 1 watt from the ultracap, with each LED each operating at 0.3 watt at around 100 lumens per watt, with roughly 90% DC-DC converter efficiency. This is 1 watt-hour from the ultracap. On high, this device would draw about 4 watts from the ultracap, with a little over 1 watt reaching each LED, given a slightly lower LED efficiency at the higher brightness and a significantly lower converter efficiency, possibly a bit over 75%. Compare this with two AA NiMH cells (at 3 watt-hours each) that together store 6 watt-hours. Ultracaps are a breakthrough technology, but the energy storage density is still pretty low, as we see here. It will be a few years before ultracaps become the most satisfactory overall choice for flashlights."
Obviously, in this case the consumer wasn't willing to pay...why didn't the producer lower the price then?
They don't have those reflectors up here in the north 'cause the snowplows tear 'em up...You would need to do something different where it snows
shhhh don't tell everyone about WinMX...