I know it has different brightness settings - I said the same myself, and I have both the taillight and the headlight. The default mode for the taillight is the mode where different flashing patterns are selected. I suppose I'm surprised you would use the taillight in solid on mode - just seems dangerous to me. I thought solid on was one of the settings in the default mode of the taillight, but it isn't - at least not according to the Dinotte website.