I sort of confused myself after I wrote that...; basically, I meant that by doing the effect using a lighting console and dimmer (full, 75%, 50%, 25%), you lose both lumens and color temperature, but using multiple sources at full, you maintain CT, but just vary lumens.
Or, to further confuse the issue: TV light is the same quality all the time, just stopped up or down.
I need sleep,
-j