This video was created by Dereck Willis about the Cheap LED lights everyone is buying, but is causing some controversy about the Whining noise at the end of his video.
I love these lights, and so do all my friends who have purchased them after me. Because of all the controversy, Here is my official test showing my results.
First test: I'm using (3) Three LED lights next to a Zoom H4n
Second test: was with the light mounted to the hot shoe using the on Board microphone on the 7D.
Not sure how Dereck ended up with a whining noise, but I did not get anything at all.
More information about these lights and where I purchased them from in the USA is listed on my blog @ cheesycam.com