I recently converted a beer light (plexiglass) using 20 LED's, resisters and a power block rated at 9V but it burned out the LED's. I When i tested the adapter it was putting out 14V's.
Question: I then tested several other power blocks i had on hand with varying voltage ratings and found most of them, not all, provided higher voltages that the tag indicated. What am i to believe when looking at these labels. I like playing with LED's but need to understand the voltage of these power blocks to ensure they work.