Just received my order and found whilst labeled as 12v, 2 of the units only output 5V. :'( I was surprised when my lights were so dim. I first thought I have wired the connections incorrectly, then tried the second PS and the same problem.... how could i wire it wrong twice? Third PS worked. A mutli meter confirmed 2 output 5V and one 12V. Waiting on a response from Ray Wu. Just letting others know, if they come across the same.