Dogs are great walking companions, great personal trainers, and great nags. If you begin walking with your dog, you may soon find his tail is wagging your walking program. They are ready to walk when you are (unlike friends and family), will tow you down the trail, and let you know when it is time to lace up your sneakers.

If I go for a walk with my parents dog I always bring my "Ralf Ottow light".

The 45-year-old Dutch optics engineer has been building his own lights since he was eight, but his recent 38-million-candlepower creation, the Maxablaster, is more like a miniature star. To start, Ottow stripped out the innards of a powerful commercial flashlight and switched in a mercury arc bulb, which generates light by creating an ultra-hot plasma between two closely spaced electrodes inside the gas-filled central chamber of the lamp. That results in a brighter, more focused beam but also kicks out more ultraviolet light (hence the sunburn, a product of early testing). So he added a specially coated reflector and designed, ground, and coated a new glass window that would trap UV rays while still pumping out light.

Powered by a pack of 54 batteries, the Maxablaster can put a bright spot of light on a cloud four miles high and illuminate a house from just as far.

How it Works see it here 

Probally you want something cooler and saver to let your dog out if you live in a bad neighbourhood.

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