Hi, I want to put some solar light in my yard, and wondering if a 100w solar panel could work for a few 3w dc lights....do i need a battery so they run at night, if so how many lights do u think i can run/ also i see elading solar light (http://www.ebay.com/itm/eLEDing-Pure-Digital-Solar-Powered-DDC-Core-80-LED-Security-Flood-Spot-Lights-/111056358247?pt=LH_DefaultDomain_0&hash=item19db798b67 ) but dont know wich one is better, the solar panel that it use is only 3w for a single light...help pls ...Thanks in advance...