I recently bought a Nighthawk 5W light and am returning it. There are too many shortcomings and I think there are better alternatives. Here are my thoughts:

1) Huge, heavy battery pack
2) Gangly wiring system.
3) Relatively expensive
4) High per light hour energy/battery cost
5) Heavy

If you want to upgrade to near solar power lighting, I think that better money is spent on a combination of bright LED lights. I posted a comparison of a $20.00 Nashbar 7 LED light with a Nighthawk 5 W light. The Nashbar 7 LED light put out more light at a fraction of the weight (LED= 3 ounces. Nighthawk = 3 lbs). Also the LED lights ran at a fraction of the battery per hour cost.

I think a much better solution is to get say four of the bright LED lights and mount them with an additional stem perch. You would have the equivelant of 20+ Watt of light at a total weight of about a half pound , with a 20 hour run time on $1.35 worth of batteries. Total cost about $90.00. You have the additional advantage of multi-beam, multi-directional focus.

That beats any of the Nighthawk lights (and probably all the other lighting systems) hands down.