Silly Question Re Brightness

old4570 · Mar 6, 2009

A P4 is ?? but a Q? what ever should be brighter ?

So a Q2 is brighter than a P4

So P Q R as you go up in the alphabet , the brighter the CREE ?

Numbers = 4 is brighter than 2 ?? or the other way round ?

P7 is brighter than a R2 ??

Marduke · Mar 6, 2009

The letter/number combos you are mentioning are a mix and LED models and bins. I highly suggest you read the Welcome Mat (FAQ) where your questions are already answered.

old4570 · Mar 6, 2009

Marduke said:
The letter/number combos you are mentioning are a mix and LED models and bins. I highly suggest you read the Welcome Mat (FAQ) where your questions are already answered.

Hidden away in the dark archives .

csshih · Mar 6, 2009

Brightness also depends on the current you drive the LEDs at.

Look up a cree XR-E datasheet.

old4570 · Mar 6, 2009

Driver current - No problem , I understand that .

Its the PQR and 234 Im trying to understand .

All things being equal , ?? a R2 beats a Q5 , a Q5 beats a Q4 or Q3
A Q2 beats a P4 , is that correct .

Marduke · Mar 6, 2009

old4570 said:
Its the PQR and 234 Im trying to understand .

All things being equal , ?? a R2 beats a Q5 , a Q5 beats a Q4 or Q3
A Q2 beats a P4 , is that correct .

That would depend. Cree XR-E P4 bin, or SSC P4 ?

But as I said, all questions are answered in the Welcome Mat.

Gunner12 · Mar 6, 2009

Also look here.

P7 is a Seoul LED, not a Cree bin. It is essentaully 4 Seoul P4s in a single package wired in parallel.

old4570 · Mar 6, 2009

Yes , I read the welcome mat , but it does not dwell into the nity grity .

And yes - Cree XR-E ,

This is all new to me , Im learning , but the welcome mat is not telling me what I want to know .

Marduke · Mar 6, 2009

old4570 said:
Yes , I read the welcome mat , but it does not dwell into the nity grity .

And yes - Cree XR-E ,

This is all new to me , Im learning , but the welcome mat is not telling me what I want to know .

Q: What's "bin"?
A: Bin codes are used to sort LEDs by luminous flux (lumen output at a specified drive level), color, tint, and Vf. For example, a U-bin Lux III will have more output than a T-bin Lux III at a set drive level. Commonly desirable flux bins (at the time of writing) are:
-Lux I: R or S
-Lux III: T or U
-Lux V: W or X
-XR-E: Q2 through R2
-SSC P4: U or V
-Rebel: 0080 or 0100

And you can view the detailed lineup here

Flux

Cree XLamp (Cool White)

Cree XLamp (Neutral-Warm White)

Both threads are prominently stickied, and cross linked with eachother.

jabe1 · Mar 7, 2009

As I see it ... to simplify, the higher letter/number combination, the more efficient the LED is at using the supplied energy (current). Some other factors come into play, but that seems to be the simplest way for me to understand it.
Please correct me if I'm wrong.

Marduke · Mar 7, 2009

jabe1 said:
As I see it ... to simplify, the higher letter/number combination, the more efficient the LED is at using the supplied energy (current). Some other factors come into play, but that seems to be the simplest way for me to understand it.
Please correct me if I'm wrong.

Depends on the company. Some codes go to flux bins, some to tint bins, some to forward voltage bins, some are specific LED model numbers.

"P4" for example can be a Cree XR-E P4 bin, or a SSC P4 model LED.

old4570 · Mar 7, 2009

Would it have been so hard to say : Yes , thats the gist of it ?

Thank you . I get it now .
:sold:

jabe1 · Mar 7, 2009

Marduke said:
Depends on the company. Some codes go to flux bins, some to tint bins, some to forward voltage bins, some are specific LED model numbers.

"P4" for example can be a Cree XR-E P4 bin, or a SSC P4 model LED.[/quote

Thanks Marduke, I didn't want to get into Flux bins etc. but I should have mentioned the differences between producers.

Silly Question Re Brightness

old4570

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