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They are a good buy for marker lights and the 2-spotlight set can handle steps and a doorway enough so you don't trip over anything -- I only use my porch light when I need to rummage around out there. (Of course if you don't get a good number of hours of direct sunlight on your porch you'd need one of the systems with the separate panels.
Those lights are low power, on the order of 1 to 2 watts. It takes 27W to light what most would consider to be an adequate indoor bulb. What's missing is a durable battery system of that size which you do not have to maintain, and which doesn't have to be replaced as often as lead acid systems. Currently lead acid is still the system of choice though because it is cheap. You can see how prices are doing for solar panels, charge controllers, and batteries, over time, at solarbuzz.com.
In the future we will end up using new nanotech batteries (www.a123systems.com), large flywheels (www.beaconpower.com), VRB batteries (VRBpower.com) or ultracaps (eestor). Most of those companies have product shipping already in small quantities to select buyers.
However, if you did want to try out something on a single lightbulb scale, one of the larger (400Wh or so) UPS systems you can get at a stationary/computer store, an inverter with low power cutoff electronics, and a 100W solar panel would be enough to run one bulb all night without beating on the equipment too badly -- it would be a rather expensive system for that purpose but one which you have the peace of mind would continue to work through the fall of civilization itself :-)
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