The LED that those power is more like 1/10 of a watt, about the same as the clock, but you would be better off getting a real PV panel, they have dropped in price so much in the last year, they are down to nearly $3.50 per watt, something like a 10-20 watt panel would keep your battery topped off and could help, a yard light panel would do nothing.
Another idea, what the newest Prius is going to do is have that PV panel run a fan or A/C once your battery is charged, so you get in a nice cool car that has been sitting in the sun.
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