TGCL-153p dimmer has an adjustment feature. I turned light on and went to both ends and did not see a difference.Also, the light i am dimming has non dimmable daylight bulbs. Dimming worked but didn't use the low range but overall it worked. And Yes I know I will likely burn the bulbs out early. I didnt like the day light bulbs and tried using an ECOSMART bright white dimmable bulb and two things happened. 1) dimming didnt work at all 2) the bright white bulb was yellow? i replaced the original day light non dimmable bulb and dimming worked again?I am puzzled - can anyone shed some light on this? (pun intended)Len