Even beginners and first-time homeowners will find it easy to install and use the XP150D light unit. Simpy screw in the adaptor to any lamp and place the light bulb. The lens ring can also be rotated so that the window is lined up with a strong source of natural light. The unit turns the light on at dusk and goes out at dawn automatically. Quick and easy to install, this product can be used indoors and out. It improves home security while saving energy.