I run the V1s...they were 1/4 the price of the others and efficiency is still 2.5.
No they don't even really know what exact spectrum will be "best". They have increased a bit of the red spectrum since V1 and slightly improved efficiency.
If you really have a concern you can buy some red supplements. I have a Saber I have used which is more like the V2. It has pluses and minuses. The red ime causes more stretch in veg and enhances flowering slightly.
The V3 board have efficiency up to 3, but the increased cost is not worth it imo. I honestly dont know why they charge so much, or why they never have them in stock. They encourage customers to go elsewhere with those attributes (imo). That said I'm a huge fan of HLG. All I have been running.