This grow light's built-in timer needs to be turned on again any time that the power is cut (power surge, smart plug, etc). It also needs its timer to be set at the exact hour when you want it to begin.
I had a spare smart plug that would make it easier to schedule and solve my lights staying off any time the power went out. However, I needed the grow light to stay on after the power was cut. Twist tie? Nope. Velcro? Nope. Dollarama hook that won't hold anything over a few grams on my wall? BINGO
You could probably cut out that switch and reconnect the wire directly. Or just replace the whole wire run from the base of the light.
There's at least some logic in these controllers as they typically allow for dimming and turning specific lights on/off. So it might not be that straight forward.
That's the proper long term solution!