The Gama Sonic Imperial II solar light fixture is commercial grade. It is ideal for business and commercial settings but also is suitable for home use. This attractive black light fixture with three of Gama Sonic's heavy-duty, rustproof cast-aluminum top-of-the line solar lanterns fits atop a standard 3 in. Dia lamp post. Each Imperial II lantern sports a light output of 300-Lumens-the brightest in Gama Sonic's entire product range-and a powder-coated black finish. Installation is easy. Just set it the GS-97NF2 on the lamp post and let the sun do the rest. Each Imperial II lantern contains Lithium Ion battery packs that charge when sunlight hits each lantern's integrated solar panels. At dusk, 21 bright-white LEDs per lantern will turn on automatically and shine through the glass panes for up to ten hours on a full solar charge-that's a total output of 1,050-Lumens from all the lights. Gama Sonic's patented cone reflector enhances the light output and glow. Beyond providing a superior combination of light brightness and duration, Gama Sonic solar light fixtures are known for their physical durability. Each Imperial II lantern's five monocrystalline silicon solar panels are protected by weather resistant, cleanable tempered glass that helps ensure long-lasting reliability. The replaceable, plugged battery packs in each lantern are good for about 1,000 charges.