Hot spot

I've used heat a shield on the last 2 grows...

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They certianly do reduce the heat/hot spot, i've had a 400w hps sitting at 25cm above the plants with no i'll effect.

Not sure if it blocks lumens tho ? may do slightly... i'm pretty darn sure their are a few different types of defusers aviable on the market tho which may be of better design.
 
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