Just an update my sf 4000 has been hanging since January 25, 2021 and no problems and def. no fire! All I did was hang it no fans blowing on it or nothing extra cooling methods. Sometimes I forget about old posts that may need updating. This is my update on the 4th grow with it and I think I can say I'm pretty happy with the purchase. A noticeable decrease in power and for sure heat. No noticeable decrease in yield or quality.