LED Down Lights connect to solar panel batteries.

Accepting input voltage of 11–15 Vdc and 22–30 Vdc, Models GL-DL04LD, GL-DL06LD, GL-DL08LD, and GL-DL06LD-IP come with bundled GlacialPower drivers, which enable direct connection to 12 and 24 V solar panel batteries without additional PV inverter, preventing possible energy waste. All models have 120

[source: http://news.thomasnet.com/fullstory/LED-Down-Lights-connect-to-solar-panel-batteries-20007672]