request bin code explanation
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VidPro
Flashlight Enthusiast
Re: newbie question alert!
BIN:
bin (bîn) noun
A container or enclosed space for storage.
verb, transitive
binned, binning, bins
To place or store in a bin.
to sort into different bins
Dafynition:
to label a production run of Leds for thier actual specs vrses the pitri dish results they promised us 10 years ago /ubbthreads/images/graemlins/smile.gif hopeing that 2 of them in the run actually meet the bin specs.
http://home.comcast.net/~theledguy/bin_codes/
BIN:
bin (bîn) noun
A container or enclosed space for storage.
verb, transitive
binned, binning, bins
To place or store in a bin.
to sort into different bins
Dafynition:
to label a production run of Leds for thier actual specs vrses the pitri dish results they promised us 10 years ago /ubbthreads/images/graemlins/smile.gif hopeing that 2 of them in the run actually meet the bin specs.
http://home.comcast.net/~theledguy/bin_codes/
greenLED
Flashaholic
Re: newbie question alert!
Try this link to see what the color code (2 middle characters -X1, XO, WO, etc.) mean: Luxeon color diagram at kj's
Roughly, the first letter tells you how bright the Lux is (higher letter, more brightness). The last letter is the Vf, IIRC.
Try this link to see what the color code (2 middle characters -X1, XO, WO, etc.) mean: Luxeon color diagram at kj's
Roughly, the first letter tells you how bright the Lux is (higher letter, more brightness). The last letter is the Vf, IIRC.
idleprocess
Flashaholic
Re: newbie question alert!
I have a concise luxeon binning summary linked in my signature.
I have a concise luxeon binning summary linked in my signature.
Re: newbie question alert!
No. The Vf is the voltage drop across the LED when the rated current is flowing through the LED. For Luxeon stars/emitters, this current is 350mA. For Luxeon III/V devices, the current is 700mA. For Red/Orange/Amber Luxeon IIIs, the current is 1.4A.
No. The Vf is the voltage drop across the LED when the rated current is flowing through the LED. For Luxeon stars/emitters, this current is 350mA. For Luxeon III/V devices, the current is 700mA. For Red/Orange/Amber Luxeon IIIs, the current is 1.4A.
chimo
Flashlight Enthusiast
Re: newbie question alert!
Due to variations in the LED manufacturing process, individual LEDs will have different light outputs, different color/tint and will have a different forward voltage when the spec'd current passes through them. Therefore the LEDs are arranged into like groups according to three criteria: output, colour(tint) and voltage. Each group will have a range. In your first post, you listed two different "bins", UX1L and WX1T. These are read (U)(X1)(L) and (W)(X1)(T) - (output)(colour/tint)(Voltage at rated current). The links posted above will decipher the letters.
The "binned" Vf is the voltage across the LED when the specific currents Evan9162 has listed above. Confusion arises as Vf is also simply the forward voltage across the LED. The forward voltage varies with the current - in general, as you increase the current, you increase the voltage. This curve is very steep in the LED's operating range (i.e. a small change in voltage represents a big change in current). You have to know which context the term Vf is being used.
Note that If is the forward current and that:
Vf x If = Power consumed by the LED.
Evan9162 has also done some excellent testing that has shown that the "binned" Vf for Luxeons drop over time. This becomes very important when driving the LEDs from something other than a current source.
Paul
Due to variations in the LED manufacturing process, individual LEDs will have different light outputs, different color/tint and will have a different forward voltage when the spec'd current passes through them. Therefore the LEDs are arranged into like groups according to three criteria: output, colour(tint) and voltage. Each group will have a range. In your first post, you listed two different "bins", UX1L and WX1T. These are read (U)(X1)(L) and (W)(X1)(T) - (output)(colour/tint)(Voltage at rated current). The links posted above will decipher the letters.
The "binned" Vf is the voltage across the LED when the specific currents Evan9162 has listed above. Confusion arises as Vf is also simply the forward voltage across the LED. The forward voltage varies with the current - in general, as you increase the current, you increase the voltage. This curve is very steep in the LED's operating range (i.e. a small change in voltage represents a big change in current). You have to know which context the term Vf is being used.
Note that If is the forward current and that:
Vf x If = Power consumed by the LED.
Evan9162 has also done some excellent testing that has shown that the "binned" Vf for Luxeons drop over time. This becomes very important when driving the LEDs from something other than a current source.
Paul
wmpwi
Enlightened
Re: newbie question alert!
So if I'm understanding this, a VW0S Lux-V is going to have an output of 113.6 to 147.7 lumens in a cool white running between 5.91 and 6.39 volts? Mistery unraveled. Now to move on to the whole lux vs. lumens vs. how bright is bright conundrum.
So if I'm understanding this, a VW0S Lux-V is going to have an output of 113.6 to 147.7 lumens in a cool white running between 5.91 and 6.39 volts? Mistery unraveled. Now to move on to the whole lux vs. lumens vs. how bright is bright conundrum.
idleprocess
Flashaholic
Re: newbie question alert!
Lumens represent total light output. Lux and candella represent light intensity. Lumens are typically fixed, candella/lux can be increased by tigheting the focus of the beam.
Knowing the candella of a LED without knowing the beam angle is useless - a laser pointer would have an absurd candella rating, but the beam angle is slightly above zero and overall light output is negligible compared to even a dim indicator LED.
There are some rough formulas to determine lumens from candella & beam angle, but the margins of error are huge and get worse with smaller beam angles.
Here's the source spreadsheet for the LED DB in my signature. Try deleting some entries and pop in some LED specs (enter candella as mcd) to see the approximate lumen output.
Lumens represent total light output. Lux and candella represent light intensity. Lumens are typically fixed, candella/lux can be increased by tigheting the focus of the beam.
Knowing the candella of a LED without knowing the beam angle is useless - a laser pointer would have an absurd candella rating, but the beam angle is slightly above zero and overall light output is negligible compared to even a dim indicator LED.
There are some rough formulas to determine lumens from candella & beam angle, but the margins of error are huge and get worse with smaller beam angles.
Here's the source spreadsheet for the LED DB in my signature. Try deleting some entries and pop in some LED specs (enter candella as mcd) to see the approximate lumen output.
wmpwi
Enlightened
Re: newbie question alert!
Wow, you've got some serious time in that data. Great reference. Now on to flux.
Wow, you've got some serious time in that data. Great reference. Now on to flux.
