Hello,
My name is Dan and I am with Timber Grow Lights. We use dimmers, and RJ12 controller jacks, on all of our lights. Dimmers allow you to use one light for full cycle usage, since veg cycles require roughly 1/2 the amount of PPF as during flowering. Additionally, dimming LEDs increases efficiency, reduces heat and increases longevity of the LEDs. On our lights, all dimmers are able to be disconnected which will allow you to run the light slightly over advertised power and also is handy in the event of a dimmer failure, as all parts are user replaceable by design.
Lastly, the benefit to dimming LEDs vs HID style lights is that there is no chromatic shift (read: spectral distribution changes) as there are with HPS/MH style lighting.
If you have any additional questions, I am happy to assist.
Have a good day
Dan