Share 'Does light wattage work?'

When I try to change light wattage to adjust scene lighting, it does not work as expected. I try to change the lighting levels with the channels but there is no change until I set the multiplier to 1x and turn the level to just above zero.  There is a very small range of adjustment.  It goes from full light to zero light withing about 5% of the slider movement.  Am I doing something wrong?  Very…