Help Choosing a Quiet LED

I have been thinking about getting 2x Kessil's for a while now because I heard they were cool and Quiet. Unfortunately I have made the realization that the zone will simply not be big enough for me. Any recommendations on a single, powerful yet quiet light would be much appreciated. It would be cool if someone could give me a dB estimate on some lights or at-least point me in the right direction. I've been thinking about getting a pro-grow260, heard they are loud but someone on the forums mentioned that its possible to build a fan silencer out of cardboard easily. Sounds sketchy to me....as the pictures looked to block ventilation lol...

I'm also worried about yeild per grow, as I doubt I would be able to hit over 15oz with only 2 kessils...

What is "the zone"?

180 watts of anything will not give you 15OZ. That product doesn't exist as far as I know. Both the progrow 260 and two Kessils H350s are 180 watts and I'd guess that two Kessils would provide better coverage than one progrow...but that's a guess.

The haight ppf-800 only makes a faint buzz sound like a florescent bulb. Solid state, no fans. But it puts out half the PAR a Blackstar 240 does. Neither will get you anything near 15oz

im planning on running 5 20w 2600k cfls in addition to the led light, any suggestions on a good led for a 15zip plus setup would be greatly appreciated

HSS is a great light ... for my seedlings... man why do you have to be so quiet? are you not going to run an inline fan anyway? maybe you should simply make the room sound proof and have all the equipment in it sorry man if you want to hit 1lbs per run you are gonna have to invest time and money, it just doesnt happen that easily and even to get 1lbs with 600W you have to really know what you are doing. Good luck