Id use the light you have.
While they do understate the power of the best 1000w HID at 1250 PPF.
The best Single Ended HID is the Hortilux HPS 1000w at 1600 PPF. The Halide probably has 1250, but the HPS 1000w comes in at 1600 PPF.
At that rate the LED is 60 PPF short of the Hortilux HPS x 1000w, but is not relevant, as the LED will keep its power much longer before it even starts to dim a little bit. The HID will lose 10% the first few weeks, and stabilize.
Also consider the Hortilux 1000w HPS is made to cover a 4 x 4 area. Your light is perfect for 4 x 4. You don't really need any more than that.
Your light being basically the same PPF will be perfect for a 4 x 4. You may want to get 4000k, but Ive seen studies that say the most important thing is Photons, and Light Intensity. Lumens Do Matter. Everything matters.
We veg with the 2100k Hortilux 1000w, and have for years, with no internode stretching. It is Blue Enhanced, just not a lot. It was the first HPS to be Blue Enhanced.
I did rrecently buy a Gavita 1700e for my buddy to use to try in Veg vs HID, as it would be nice to use 1/3 less electric, and get a couple 100 more umol.
Spyder 2i is 1700 umol, as is the Gavita 1700e.
New Phillips coming out is 635w, and 1800 umol, but they will only sell 40 at a time for $32,000.