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The principle of work for solar motion lamps:

Solar motion lamps work by collecting solar power during the day through solar cells located on the light. This solar energy is used to recharge a battery (usually a NiCad rechargeable battery), which in turn powers the lamp at night.
Solar motion lamps usually use a strong LED lamp. LEDs are an excellent choice for solar lamps because they use far less power than traditional bulbs and halogen lamps.

The application of solar motion lamps:
Solar motion lamps are built with weather resistant materials, so they can be left on your homes exterior in all types of conditions.
Some models of solar motion lamps include solar panels that are strong enough to collect energy even in overcast conditions, making the lamp even more useful. You can set the duration that the lamp shines when it detects motion (any where from 0.5 minute to 3 minutes), as well as being able to position it so that it can detect motion up to 90 feet away. The trigger for the motion lamp is a passive infrared motion detector that is safe for use around all people and animals, and does not require additional high tech equipment.
Solar motion lamps are an excellent way to keep your home and property safe from intruders and other problems, all while being cheaper and more green than other choices. You also have the choice of mounting your solar motion lamps on a post (this will be provided) or on the side of your house or garage.
If you need just one or many, the solar powered versions of motion lamps are the easiest choice for your lighting needs.