I keep my 315s pretty high with good results, everyone tells me you really need to slam them to see growth but I feel like that might only be true for flower.
here's veg:
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and mothers:
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here's a Hells Angels OG mom that's only 10 weeks old...she's diggin the spectrum for sure. You can see how high the lights are too:
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I can touch the tops of the reflectors and get within two inches of the bulb before I feel any sort of heat, I've burned myself on these a few times and it's definitely nowhere near what happens when you touch a 1ooo. Can't wait to see what happens in flower with these, if anyone has pics I'd love to see them!