I would get your friend to send you a picture of what it is he is selling you, Then we can all better help you as well you can better help yourself. Like stinky said a generator is mad expensive and runs on GAs. well most of them.

You were mentioning somthing about a battery and stuff. Which would leave me to believe that it is a UPS also known as a power conditioner and or surge protector. They can come with a battery in it so when the power goes out in your house. From say a lightning storm. The UPS takes over and electricy still will flow. For a limited amount of hours. I ahve never read about or seen models that take electricy then charge a battery so your using less wattage? but they may exist.

Its a good thing to have cuz it helps maintain steady current to in your case your new HPS Light. It will also prevent it from shorting out if too much energy is sent through your house.

I use them at the Studio I work at to protect the Avid computers and Pro Tools rigs. These computers cost anywhere from 20,000 to 250,000 with all the cards and Expansion chases. 1000 bucks for a good UPS saves us in the end if the building gets hit by lightning, faces a power outage or power surge.

in a power outage when the power comes back on. A jolt of more wattage can be sent out your socket and fry some electronics. ie. your light or in my case the computers.

Justa bit off topic but some people might care to know...

kd_special