Grrrr…
My business owner + cannabis grower brain figures that they were getting call from growers who were damaging their plants + the cost of the 420 watt driver + very few people will actually use all of that light so they came out with a product that will still sell but will be cheaper to produce and growers who think that 100% at 12" hang height is a good idea won't be able to fry their plants. All of those are rational reasons but I got left with my d*ck in my ear.
The new light is a decent light and I like the spectrum more than the spectrum on the Mars 320 (300?) watt model but the V1 4500's, the one that you have, is the cat's meow.