What do you mean with static of winter? e.g. you wear Nylon Pants and get electric Shocks when you touch Metall or what do you mean? either wear different clothes or touch something like your heater with the full Hand to avoid that
but what does this have to do with the light? (if this is actually what you meant?
I bought so much in China (having fun building other electronical stuff)...never had Quality issues with them but one thing Comes to my mind: a freaking Cree XML-U2 (like 4 Emitters in one, looked like art) yet it burned out. Sent photos, next day chinaman wired my Money back.
About the good Body/case...I dont think my DIY Looks too shabby, and maybe its even more safe, since i seperated the light from the drivers and with that from the mains...gives me a better feeling working around it...
And you can do funny stuff like attaching fans to the light for the plans as i did or other funny stuff that comes into mind.
Maybe ill add a microcontroller for temperature and fanspeed controll or something else.
About the whites: I think mainly the reason is the efficiency of white leds compared to others. And its been like proven plants even suck in green and yellow and whats not...
so i think its like: more efficiency + plants ultilize the other wavelengths too = 1 White puts out more usuable stuff as the same Wattage red = Profit, and maybe add some extra red