LED lights are not simple glowy things like incandescent light bulbs. To get the benefits of LED, you have to be pretty smart.
Smart, in this case, usually means pulse width modulation:
Even if you don't get a "dimmer" knob to play with, does not mean that the factory did not implement the PWM dimmer circuit and simply nail down the knob's value with a single-value resistor.
Want to set PWM in action? Next time you are behind a car at night, shake your head back and forth as fast as you can while keeping your eyes open. Standard incandescent bulbs in the vehicle in front of you will appear as the smudges of light that you'd expect. LEDs driven with PWM will appear as discrete dots of light. In effect, you are engaging in stop-motion stroboscopic vision as the LEDs flash ON OFF ON OFF ON OFF ON faster than you can detect (like a TV or movie being too fast for you to see the individual picture elements change).
Even funner? Bite a popcicle stick between your teeth and pluck it like a guitar string. As it vibrates your skull, you might see the secret morse-code message that those crafty EEs are embedding in brake lights!
Anyway, PWM, as implemented by lazy ignorant trolls, is a generous provider of all sorts of bad radio frequency interference.
All the best,