Old 05-08-2014, 03:51 PM #1
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Default Typical efficiency

Hi,
I've bought a 200mW ebay red line laser for scanning.
It seems to be weaker than a couple of others I have got previously.
It shows current draw of 117mA @5V, while typically I see 280mA in specification of alike ones.
May or may not the typical efficiency allow 200mw at that current?
I've red in some threads here that 18-25% is top efficiency, but not sure if it was meant about red lasers.



Last edited by kivig; 05-08-2014 at 03:54 PM.
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Old 05-08-2014, 10:19 PM #2
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Default Re: Typical efficiency

That depends on the type of driver used. But even if the driver was 100% efficient, the overall power input is on the low side. I suspect you are correct and that the power is under 100mW.
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Old 05-08-2014, 10:48 PM #3
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Default Re: Typical efficiency

Thanks.
Just to be clear - the seller claims 200mW measured optical output, before line lens.
Total consumption calculates to about 585mW, so the diode plus driver must total in 34% efficiency together, for this to be physically possible. I wonder if 34% is something at least remotely close to what exists in reality.
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Old 05-09-2014, 02:19 AM #4
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Default Re: Typical efficiency

No way it is putting out 200mw. Sorry

For 200mw red you typically need about 300-400ma in, and that is AFTER the driver.

You should open a claim or get your money back if possible.
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Old 05-09-2014, 05:38 PM #5
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Default Re: Typical efficiency

Well, I opened a case and wrote an angry letter
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Old 05-09-2014, 06:31 PM #6
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Default Re: Typical efficiency

Quote:
Originally Posted by KRNAZNBOY View Post
No way it is putting out 200mw. Sorry

For 200mw red you typically need about 300-400ma in, and that is AFTER the driver.
Definitely seems to be the case. My LOC that does a tad over 200mW with acrylic lens draws around 410-420mA at the tailcap off of a fresh battery.

Also, I made a pointer out of a flat red diode and used a single 7135 chip, and it draws exactly 350mA and does around 170mW with acrylic lens.

It is either a lower powered diode, a crappy driver, or a combination of both.
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