The reason the lamp has a shield is that it is intended to be air-cooled, not to block harmful rays- the glass is meant to allow %transmission approaching 100%. You will want to run it air-cooled with a blower that suits the volume of your grow room and heat of your lamps, if exhausting through the hood.
stinkyattic Reviewed by stinkyattic on . happy frog and light distance is happy frog okay to use during germination/seedling stage. And for a seedling how far should i place a 400w MH lamp. I was told when i bought it that happyfrog has special bacteria and things that begin to grow after 2-4 weeks of water and heat. Rating: 5