Luxeon Leds

?

!!::!!::

Guest
Can anyone tell me how I could test the difference between a 1 watt Luxeon
LED and a 3 watt Luxeon led ? In as much as they both look the same, neither
has any markings saying 1 or 3 so I'm assuming I know which one is which but
would like to know for sure before attaching them to their drivers..
Would there be a difference in resistance or anything else one could
measure with a MM ?

Thanks,
Steve.
 
In message <1207114609.454069@zuxdc2y.zurich.com.au>, "!!::!!::"
<somewhere@onthecoast.org> writes
Can anyone tell me how I could test the difference between a 1 watt Luxeon
LED and a 3 watt Luxeon led ? In as much as they both look the same, neither
has any markings saying 1 or 3 so I'm assuming I know which one is which but
would like to know for sure before attaching them to their drivers..
Would there be a difference in resistance or anything else one could
measure with a MM ?

Thanks,
Steve.


Current limited supply, stare directly at it for 30 seconds timed with a
Click to expand...
stop watch and time how long it takes for you to get your sight back?
Seriously though, there is a guide n Luxeon 'binning' codes floating
around that may give you more information as to how they classify and
mark their product.

http://www.lumileds.com/pdfs/ab21.pdf

http://www.nzherald.co.nz/category/story.cfm?c_id=55&objectid=10501416
--
Clint Sharp
 
In message <p0qEgmB7t68HFwB+@clintsmc.demon.co.uk>, Clint Sharp
<clint@clintsmc.demon.co.uk> writes
http://www.nzherald.co.nz/category/story.cfm?c_id=55&objectid=10501416
Ooops... Funny but not at all relevant, sorry...
Click to expand...

--
Clint Sharp
 
Clint Sharp <clint@clintsmc.demon.co.uk> wrote in message news:0V8TInChA78HFwwA@clintsmc.demon.co.uk...
In message <p0qEgmB7t68HFwB+@clintsmc.demon.co.uk>, Clint Sharp
clint@clintsmc.demon.co.uk> writes
http://www.nzherald.co.nz/category/story.cfm?c_id=55&objectid=10501416
Ooops... Funny but not at all relevant, sorry...

--
Clint Sharp
Click to expand...
Not funny, either
What are you smoking these days, Clint ?
 
"glenbadd"
On Apr 2, 4:36 pm, "!!::!!::"

Can anyone tell me how I could test the difference between a 1 watt
Luxeon
LED and a 3 watt Luxeon led ? In as much as they both look the same,
neither
has any markings saying 1 or 3 so I'm assuming I know which one is which
but
would like to know for sure before attaching them to their drivers..


Measure the current at full brightness,
Click to expand...

** Begs the question - fool.

Only the maker's know for sure what brightness can be sustained for the
rated life span.

That why we have things called specs.


..... Phil
 
On Apr 2, 4:36 pm, "!!::!!::" <somewh...@onthecoast.org> wrote:
Can anyone tell me how I could test the difference between a 1 watt Luxeon
LED and a 3 watt Luxeon led ? In as much as they both look the same, neither
has any markings saying 1 or 3 so I'm assuming I know which one is which but
would like to know for sure before attaching them to their drivers..
Would there be a difference in resistance or anything else one could
measure with a MM ?

Thanks,
Steve.
Click to expand...
Measure the current at full brightness, the power in watts will be
about the current times the voltage across the LED.
 
"glenbadd"
"Phil Allison"
Measure the current at full brightness,

** Begs the question - fool.

Only the maker's know for sure what brightness can be sustained for the
rated life span.

That why we have things called specs.


... Nice one. You noticed I deliberately didn't say how full
brightness was determined.
Click to expand...

** Full brightness = maximum brightness.

The point is that this is not the same as NOR indicative of the maker's
speced brightness or the maker's speced input power level.


I'm just throwing some ideas,
Click to expand...

** No - you were *begging the question* !!!

A tiresome mistake in reasoning beloved by all fools.


....... Phil
 
On Apr 3, 1:21 pm, "Phil Allison" <philalli...@tpg.com.au> wrote:
"glenbadd"

On Apr 2, 4:36 pm, "!!::!!::"

Can anyone tell me how I could test the difference between a 1 watt
Luxeon
LED and a 3 watt Luxeon led ? In as much as they both look the same,
neither
has any markings saying 1 or 3 so I'm assuming I know which one is which
but
would like to know for sure before attaching them to their drivers..

Measure the current at full brightness,

** Begs the question - fool.

Only the maker's know for sure what brightness can be sustained for the
rated life span.

That why we have things called specs.

..... Phil
Click to expand...

.... Nice one. You noticed I deliberately didn't say how full
brightness was determined.
Short of having a light meter, maybe measuring the die temperature and
trading that
off against a life span derating could give a better idea. I'm just
throwing some ideas,
not trying to be definitive.
 
glenbadd wrote:
... Nice one. You noticed I deliberately didn't say how full
brightness was determined.
Click to expand...
Phil's point, that you seem to have missed, is that you can't
and shouldn't try to *determine* full brightness. Instead, you
should read the manufacturer's spec, since they conduct proper
testing and quality control to find a figure for which they can
guarantee a specified lifetime.

After all, if you could pump enough energy in, I'm sure you could
make it brighter than a supernova... for a short time.

Which leaves you guessing, since you don't know which part you
have, so you don't know what spec to read. If you know which of
a small number of possible parts you have, read the specs of all,
find some specified difference in behaviour that you think you
can measure, and do that.
 
Thanks for all the replies I guess i'll figure it out or burn them trying
:) watch for the supanova !!

"Clifford Heath" <no@spam.please.net> wrote in message
news:47f9b8b0$0$8036$afc38c87@news.optusnet.com.au...
glenbadd wrote:
... Nice one. You noticed I deliberately didn't say how full
brightness was determined.

Phil's point, that you seem to have missed, is that you can't
and shouldn't try to *determine* full brightness. Instead, you
should read the manufacturer's spec, since they conduct proper
testing and quality control to find a figure for which they can
guarantee a specified lifetime.

After all, if you could pump enough energy in, I'm sure you could
make it brighter than a supernova... for a short time.

Which leaves you guessing, since you don't know which part you
have, so you don't know what spec to read. If you know which of
a small number of possible parts you have, read the specs of all,
find some specified difference in behaviour that you think you
can measure, and do that.
Click to expand...
 
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