Now that's a good choice. I also have the SF1000, but I use it to germinate. But if he added an SF1000 to his 150 Watt HPS it would be about right. They are only 100 watts ea. but are equivalent to about a 250 watt HPS. With 2 of them you could eliminate the HPS completely. His tent temp would be cooler also as HPS puts out a lot of heat.I got a couple spider farmer 1000s and they're brighter than hell, cost me $100 each on sale around black Friday last year, had to distance em from my girls so they don't roast into green confetti. Just my setup, YMMV.