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Old 09-15-2010, 12:46 AM #1
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Default LED vs LD efficiency

What is the input/output efficiency of LDs versus LEDs? That is, if you put the same amount of power in to a red 650nm LED and 650nm LD, without any optics beyond the diode window/LED dome, which one will register higher on an LPM, and by how much?


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Old 09-16-2010, 12:25 AM #2
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Default Re: LED vs LD efficiency

Laser diodes are often a bit more efficient. You can expect conversion from electrical power to optical output to be in the order of 20-25% for a good laser diode. Most high power LED's don't go much beyond 10% as is, but they do provide a wider range of colors.

If you want to have just 660 nm, a red LD is more efficient than a red LED... but the red led will probably put out in the 650-620 range, making it appear more bright to the eye.
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Old 09-16-2010, 12:42 AM #3
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Default Re: LED vs LD efficiency

OK, cool. I was just thinking about how super low power/long runtime is a current fad over at CPF.
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Old 09-16-2010, 02:12 AM #4
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Default Re: LED vs LD efficiency

The new blue and violet diodes are inefficient compared to the IR and red LDs, since that tech has been around for many more years.

A typical 808nm pump will produce 2W light out with ~4W in, versus 1W light out with ~4W in for the "1W" 445nm diodes we are using.

I don't play much with LEDs, though, so I don't know any specific figures for their power to light efficiency...
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Old 10-25-2010, 12:46 PM #5
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Default Re: LED vs LD efficiency

Quote:
Originally Posted by RA_pierce View Post
The new blue and violet diodes are inefficient compared to the IR and red LDs, since that tech has been around for many more years.

A typical 808nm pump will produce 2W light out with ~4W in, versus 1W light out with ~4W in for the "1W" 445nm diodes we are using.
Thats true, but 1 watt of optical output for 4 watts of electrical power is still amazingly good compared to most other light sources. 25% efficiency gives fluorescent tubes a run for their money, though sodium lights still remain unsurpassed.
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Old 10-26-2010, 03:17 AM #6
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Default Re: LED vs LD efficiency

Yup^, except for a select few (experimental?) low power LEDs. and just to throw a number on it:
According to Phillips and the CIE charts on luminous efficacy,

32000lm/180W * W/520lm = 61Watts light output for 180W

Low pressure sodium lamps can have 34% efficiency.
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