I am constantly looking for good environmental blogs and have been following a really good one lately named “Environmental world for all”. The site is authored by a university student in peace studies with minor in environmental studies. One of the author’s recent posts discusses the benefits of solar LEDs for use as Christmas lights. It is a really well thougth out article and in it the author discusses the pros and cons around this issue.
When I left a comment and asked him about the ability to recycle these devices he brought my attention to this site (Solar Lights Recycling | Your Solar Link) in the US that is trying to set up a recycling program for these products.
If you are interested in environmental issues I think a few minutes browsing these two sites would be time well spent.