Hi, Marvin

What are your dimming points? 400/600/1000, or 500/750/1000..
I use a 1K HPS (GA6 is right about the bulb choice) that I keep at 750 watts, for a 4x4 area of my flower tent. I've tried running at 1000 watts, but it just isn't worth the heat issues, for me.
In Summer, I use LED panels in place of the HPS, for heat reasons.
In your case, I wouldn't worry too much about PAR/Lumens, etc, as you will have adequate light with the dimmable 1K setup.
As for Kelvin/light temp, here's my 2 pennies...
Some growers run autos under Metal Halide (MH) bulbs throughout their grow. Its more of a blue light, and best for vegetative growth, according to the science behind it.
I use MH for veg only, and switch to High Pressure Sodium (HPS) bulbs for flowering. A red spectrum light, that the scientists say promotes flowering and "fruiting"... Mmmmm Buds....
My flowering tent (4x8) has 600 (real watts, 900 spec) LED on one side, and the HPS on the other. My veg tent has a 1K MH, running at 750watts.
The Eye Hortilux is a great bulb. I have one in the flower tent right now, and it is head and heels above the cheaper Sylvania bulbs I've used. You'll not go wrong by purchasing one

Best to you, and I hope you'll put up a journal when you have things sorted
:Sharing One: