DiY LED - Cree CXA3070

predman said:
What do you mean by that? By rating.
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So a Cree CXB3590 COB LED chip can be run as high as 110W. This is its nominal rating. Running it this way will result in efficiency of about 45%. Running it at 50W returns 56% efficiency, but uses twice the number of chips at fifty dollars each. Going even further, running the same chip at 23W gives 64% efficiency! ...at the up front cost of twice again the number of chips. What the user wants determines the efficiency vs cost level that makes most sense to them.
 
ttystikk said:
So a Cree CXB3590 COB LED chip can be run as high as 110W. This is its nominal rating. Running it this way will result in efficiency of about 45%. Running it at 50W returns 56% efficiency, but uses twice the number of chips at fifty dollars each. Going even further, running the same chip at 23W gives 64% efficiency! ...at the up front cost of twice again the number of chips. What the user wants determines the efficiency vs cost level that makes most sense to them.
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I understand what you mean! But efficiency is a vague concept still...

Efficiency compared to what? And what number of efficiency should you strife?

So if i want a equalivant of 1200 watt. I need 12 Cree CXB3590 COB LED's.

But my efficiency will be only 45 %?

If i want 56% efficiency, i wil need 24 Cree CXB3590 COB LED's?

If i want 64 % efficiency i will need 48 Cree CXB3590 COB LED's?
 
predman said:
I understand what you mean! But efficiency is a vague concept still...

Efficiency compared to what? And what number of efficiency should you strife?

So if i want a equalivant of 1200 watt. I need 12 Cree CXB3590 COB LED's.

But my efficiency will be only 45 %?

If i want 56% efficiency, i wil need 24 Cree CXB3590 COB LED's?

If i want 64 % efficiency i will need 48 Cree CXB3590 COB LED's?
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Efficiency as in converting electricity to photons. 100 watts of 45% efficient light gives 45 watts of light, rest is heat. So, the higher the efficiency is, the less power you have to use for usable light :)
 
Snaddehat said:
Efficiency as in converting electricity to photons. 100 watts of 45% efficient light gives 45 watts of light, rest is heat. So, the higher the efficiency is, the less power you have to use for usable light :)
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Thanks! that was understandable :P But why would not everyone go for 100% efficiency? Only because of cost reduction? (buying fewer leds?) I mean, the way i see it... going for 100% efficiency is a higher investment, but pays out in the long run rite?

But if i want to build a equilavant of 1200 watt HPS, and i choose 12 LEDS that only run at 45% efficiancy... i only get 540 watts of 100% efficiancy?! how does this works? :P

Also, can anyone explain to me why Cree CXB3590 COB LED should be the best choice at this moment?

and what about this?

So a Cree CXB3590 COB LED chip can be run as high as 110W

What do you guys mean by can be run as high as?

I guess what you guys mean is that you can run the led on different watt's rite?

How do you do that? What else do i need beside LED's?
 
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predman said:
Thanks! that was understandable :P But why would not everyone go for 100% efficiency?
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100% efficiency is impossible. it would mean there is no loss converting electricity to light. Impossible in the real world.

In fact impossible even in an ideal world. #STUDY laws of entropy, basic energy physics etc.
 
PurpleBuz said:
100% efficiency is impossible. it would mean there is no loss converting electricity to light. Impossible in the real world.

In fact impossible even in an ideal world. #STUDY laws of entropy, basic energy physics etc.
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Yeah what i meant was, as near as possible :D But what i am trying to understand is, if i want to build a equivalent of 1200 watts HPS, how can i calculate what i need?
 
PurpleBuz said:
100% efficiency is impossible. it would mean there is no loss converting electricity to light. Impossible in the real world.

In fact impossible even in an ideal world. #STUDY laws of entropy, basic energy physics etc.
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You'd be absolutely amazed at just how close we come to to 'perfect' or 'ideal' these days. It just takes creative thinking... or brute force, lol

Why, I'll bet you that someone WILL figure out how to use an LED chip at nearly 100% efficiency- and they'll do it sooner than you think.
 
ttystikk said:
You'd be absolutely amazed at just how close we come to to 'perfect' or 'ideal' these days. It just takes creative thinking... or brute force, lol

Why, I'll bet you that someone WILL figure out how to use an LED chip at nearly 100% efficiency- and they'll do it sooner than you think.
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so if I create a perfect ball, perfectly round with no surface imperfections how long will it roll on a perfectly flat surface that also has no surface imperfections ? If its perfect with no friction it will roll forever and ever.

BUTTTTTTTTTTTTTT There is NO such thing ....................
 
PurpleBuz said:
so if I create a perfect ball, perfectly round with no surface imperfections how long will it roll on a perfectly flat surface that also has no surface imperfections ? If its perfect with no friction it will roll forever and ever.

BUTTTTTTTTTTTTTT There is NO such thing ....................
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Air resistance and oil film friction will slow it down. Just gotta account for all factors... bongsmilie

Truly gifted engineering happens when proven principles are applied in new ways.
 
PurpleBuz said:
so if I create a perfect ball, perfectly round with no surface imperfections how long will it roll on a perfectly flat surface that also has no surface imperfections ? If its perfect with no friction it will roll forever and ever.

BUTTTTTTTTTTTTTT There is NO such thing ....................
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Electrically speaking we are getting closer and closer to zero resistance. Super Conductor progress is paving the way. Right now they have to be very cold to work at near zero resistance, there are however high temperature conductors also that are more recent discoveries. There are quite a few researchers working on room temp super conductors. Never say never.

http://www.superconductors.org/
 
SomeGuy said:
Electrically speaking we are getting closer and closer to zero resistance. Super Conductor progress is paving the way. Right now they have to be very cold to work at near zero resistance, there are however high temperature conductors also that are more recent discoveries. There are quite a few researchers working on room temp super conductors. Never say never.

http://www.superconductors.org/
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are you dumb or what 100% in the real world is impossible. there will always be some loss.
 
SomeGuy said:
Electrically speaking we are getting closer and closer to zero resistance. Super Conductor progress is paving the way. Right now they have to be very cold to work at near zero resistance, there are however high temperature conductors also that are more recent discoveries. There are quite a few researchers working on room temp super conductors. Never say never.

http://www.superconductors.org/
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When I was graduating, this was an exciting new field of research and Colorado State University's engineering department was- and remains- at the leading edge of research.

It demonstrates the point I was making above; of course the holy grail of ZERO resistance is impossible, but getting impossibly or practically indistinguishably close isn't- and sometimes it's quite accessible.
 
ttystikk said:
When I was graduating, this was an exciting new field of research and Colorado State University's engineering department was- and remains- at the leading edge of research.

It demonstrates the point I was making above; of course the holy grail of ZERO resistance is impossible, but getting impossibly or practically indistinguishably close isn't- and sometimes it's quite accessible.
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yeah that's cool, love to see 99% efficient, but don't forget to take into account what it takes to get there.
way beyond what we could ever expect from phosphor technology which we know has a number of points loss in efficiency at best.
 
PurpleBuz said:
how do you expect to beat 100% efficiency. its basic laws of physics which says its impossible.
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Read what I wrote carefully; I said that while exactly 100% efficiency is often impossible, getting so close as to be practically indistinguishable for the purpose at hand is certainly not. That's not beating 100%, it's finessing it!

Your own ball bearing is a great example.
 
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