A different approach to DIY COB

Acerman said:
Thank you. that means a lot. I was not sure if this idea would be accepted by the community ( its wood ...only a idiot would put wood and electricity together..its going catch fire...stuff like that) but the response has been amazing so from now on i will be building all of my lights as wood based. more build logs will be coming soon!
Click to expand...
Would love to see a curly maple. I'm sure it would be beautiful.
 
While the temperature of the cob is not hot enough to ignite wood (it would need to be 300-400 degrees fahrenheit) there is still a concern in my opinion. Over time the heat will slowly dry the moisture out of the wood near the cob which will in turn lower it's ignition point.

I think if you extended the cob and heatsink slightly below the bottom of the hole it's mounted in the vast majority of the intense heat from the cob will not be directed at the wood. The way you have it now the inner ring of the hole it's mounted in is getting blasted.

I've thought about doing this with wood but it's nice to see someone adventure into it. I like the idea alot but maybe you can refine your design as you build more. I would definitely be putting fire retardant paint/stain on it also.
 
Danielson999 said:
While the temperature of the cob is not hot enough to ignite wood (it would need to be 300-400 degrees fahrenheit) there is still a concern in my opinion. Over time the heat will slowly dry the moisture out of the wood near the cob which will in turn lower it's ignition point.

I think if you extended the cob and heatsink slightly below the bottom of the hole it's mounted in the vast majority of the intense heat from the cob will not be directed at the wood. The way you have it now the inner ring of the hole it's mounted in is getting blasted.

I've thought about doing this with wood but it's nice to see someone adventure into it. I like the idea alot but maybe you can refine your design as you build more. I would definitely be putting fire retardant paint/stain on it also.
Click to expand...

I believe I addressed the contact point between the heatsink and the wood base. the heatsinks are sitting and 1/8 of an inch above the base on risers. the fans are blowing down into that space and air come out around the bottom so there in movement. but I agree that the design needs to be more thermally sound.
My next project will be a 600w+ fixture so thermal management will be a big part of the design.
 
I know a lot of very reputable veterans have stickied this thread, and I am thankful for your kind words and support. So with that in mind, i would like to pose a design question.
How much 660nm should I use for a 3x6 space?
Is it coverage or power that is more beneficial? ( lots of 3w stars vs. a couple strategically placed )
With the proper amount of 660nm would everyone recommend 4000k over 3000/3500k mix? I say this solely from the cree reference design paper.

Thank you in advance for all your assistance.
 
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