I've built an arduino nano clone, a 12V power supply and a bit of digitally-adressable LED stripe into a small children's lamp (if you're curios, here's a more detailed description with pictures). While it works just as intended, I find it difficult to get a grip on possible safety considerations (might I have made a mistake somewhere - how likely is this thing to burst into flames?).
Currently my approach is very simple: - only use it when we are in the same room (but not as a night-light for our child) - have a fire alarm in the room (they're mandatory in Germany anyway)
However, are there safety guidelines or recommendations I can consider, and maybe steps to either test or improve the safety? I've already hat a look at the forum search and found this post as a starting point: http://forum.arduino.cc/index.php?topic=1980.0