I believe they are about the same. I think it's just the colour that makes one think in a seasonal sense. I had a 250W MH vegging my NFT system some years back in a confined space. when I switched to HPS, my hygro max/min meter was still giving similar readings...

When I go in the garden, which is illuminated by a total of 3kW of HPS, I feel like throwing some sand on the floor, folding out the deck chair and rolling my trousers up while putting my feet in a bowl of water simulating the sea/beach... The amber throw of the mid summer

Happy harvesting