Hps and distance

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Auto Warrior
Jan 7, 2018

I got a couple of autocobs that are my main lights as of yesterday.

But I also got a couple of 250w hps that I'll strictly use for heat.
As of now during cold nights, they sit at a distance between 30-40 inches which I know is way too much for growing.
But do the plants get any usable light at all at that distance?

Just curious about it, as they are not important for the growth.