George,
In full sunlight, the -06 DIM we allow is 18% brightness. Two more steps would be 10% brightness.
The backlight is about 9W at 100%, so 8% is .7W, or 58mA @ 12V. Given that SkyView's base draw without the screen is about 2,000mA, this is only an improvement of 3% less power.
It's hard to imagine that you can really see a 10% screen in full bright sunlight. If you're not flying in full sun and want less brightness, you can adjust the brightness curve in setup to allow you to go dimmer when you are not in a full daylight environment.
