Originally Posted by
friendly_electrician
A 600w hid in a 2x4 would be quite damaging to many plants. It could light an area 50% larger, to levels akin to the mid day sun on the equator. A time where even accustomed plants can be doing more healing than growing.
Just reading between the lines to see where you're at, I think a 315w CMH might be in order. I have limited knowledge of them, but the useful output seems on par with a 600, on a watt for watt basis. You would want one with a budget style shade to illuminate your 2x4. Later, you could add some leds to assist it. For now though, It's likely all you need, and a simple installation. Allowing you to get on with growing something sooner.
I think the latest H influx look good, but the sizes readily available are limiting. You have to sum them up and then look at dimming. I'm not convinced it's worth it. I use led's to veg, and as side lighting. The Citizen one's. I wouldn't use them as main flowering lights though. The numbers may look convincing, but the numbers applied to more traditional lighting are for par light, which doesn't even include 660nm output. You can literally feel energy coming off a sodium that's not measured during comparisons. Which highlights the futility of such comparisons quite well.
People are loving them CMH lamps. Get a net across your space to train them to keep some distance away, and you should be golden.
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