Looks like the half an hour duration is only good for powering a LED at a small power.
The light seen in the video at the 55 seconds mark, shows the LED at full power and the weight drop speed is about 0.7 cm per two seconds (again, aproximately from the video), thats about 4-5 minutes for a meter of height.
Looks like the half an hour duration is only good for powering a LED at a small power
Yes, about a tenth of a watt (see the numbers upthread). However, that gives an LED light output that's comparable to a kerosene lamp. So it could be worth it for the target users.
