Agree with Daniel.
If they are the cheaper units, then yes you can see the power cycle of the transformer/dimmer unit inside of them (if they are cheap DMX units).
By the way... I found the article in the
April 2011 Church Production Magazine. There was a peer article that referred to having a good lighting meter that can also read color temp, and carry a set of theatrical gels or light filters so you can compensate for the various colors if necessary.
If you run into a place that is using say ETC Selador LEDs (500-1200 per fixture, depending on size) then you wont notice it. ETC even makes a Selador series color balanced LED light (
D40 Studio) which is really nice for photo or video, that can be set to whatever color temp you want.
A member of my church who was "helping" by purchasing and donating because he found them on sale, brought 5 American DJ 42" tri-color LED bars to the church for a back wall wash. They look ok visually, but in photos and videos, they seriously wreak havoc. I have since explained to him what we really need. Oddly enough, he agreed and has started donating funds directly to the AV budget.
Good luck with your lighting adjustments. Are you trying to do it in PS or have your tried LR for a first pass at it?