Each bulb, over it's lifetime, prevents over 1000 lbs. It is a simple, steel parabolic mirror that, at it's focal point, will reach over 1000 degrees. This product is lots of fun, great for camping, on the boat. Makes a great gift. A great inexpensive way to start using solar energy.
Rechargeable batteries are a pretty easy purchase decision.
Using rechargeables, you pay pennies. Disposable batteries are a major source of toxic mercury released into the air. Rechargeable batteries, particularly Ni-Mh and rechargeable alkaline are very friendly to our environment. That means if you treated them well, these batteries, if charged and discharged twice a week, could last almost 10 years. Rechargeable Batteries and more. .