I agree with everyone else here. Those LED's are not going to create enough heat to cause any eyebrows to be raised. Roof space tends to be the hottest part of a house anyway and gives off a signature all the time. The main concern is with smell. Ill skimp and save here and there on some stuff, but the ONE thing i will not skimp on is a good fan and filter. Ill gladly pay extra money for a brand name Phat or Phresh carbon filter than an unbranded one off ebay. As long as you cant see neon purple through a window/attic vent from the street, smell is your main concern. If you got that covered, its all smooth sailing! :thumbs: