LX6200HV colour difference

Hi,

I have 4 x 6200HV's running on my display, purchased at the time the 7200's were first released, so not so old, and set up as 1xmaster/3xslave. I had noticed at the time that one of the units ran a slightly different colour temperature ... 3 x 'ice' white and the 1 x 'yellow' white ... but have been too preoccupied with business to do anything about it.
Now, I have tried to resolve this and get all 4 units to be the same colour temperature. I have tried to set it up 'standalone' with the same light plan to resolve the problem but I have been unable to fix this situation. Does anybody have some advice as to how this can be rectified, please ?

Check your "Energy options" settings page and make sure all fixtures are set to the same settings.

Thank you Vinny ... all power settings now synchronised ;)