i am growing with 900w of LED that i did with 2000w of HPS and my weed is much stronger with the LED's...if you get good ones 300w of LED will blow your 400's away! So if you can find some good ones they are well worth it and they pay for themselves in energy savings and no bulbs to buy :thumbsup:

just something to look into with your situation....if your exhaust was bigger then i don't see any issues stopping you but heat could e a problem and only a 2" exhaust!

look at my bottom link...that is my LED grow and flower :jointsmile: