anglecoral
New member
Is one better than the other ?
Difference between Cree XT-E and XP-G Cool White LEDs?
- Thread starter anglecoral
- Start date
jT415Gz
New member
one of the two produces more light @ less power with more efficiency.
sorry but I forget which of the two models are the more recent.
If I were you I would go to the Sponsor Forum Area / Rapid LED and ask there, if no one here can confirm the model I am speaking of.
I'm leaning more towards it being XP-G as they have them on their website and I'm sure they carry the latest diodes available.
sorry but I forget which of the two models are the more recent.
If I were you I would go to the Sponsor Forum Area / Rapid LED and ask there, if no one here can confirm the model I am speaking of.
I'm leaning more towards it being XP-G as they have them on their website and I'm sure they carry the latest diodes available.
cree xt-e vs xp-g
cree xt-e vs xp-g
XT-E are the latest and greatist from cree. Not to mention the the price difference. I've only used and have the XP-G emitters especially the RB. Are R-E-diculous..coral "pop" is unreal...IMO....if. ur starting fresh, try out the XT-E and let us know.....im on a budget so im going with the new bridgelux instead.....
cree xt-e vs xp-g
XT-E are the latest and greatist from cree. Not to mention the the price difference. I've only used and have the XP-G emitters especially the RB. Are R-E-diculous..coral "pop" is unreal...IMO....if. ur starting fresh, try out the XT-E and let us know.....im on a budget so im going with the new bridgelux instead.....
joelespinoza
New member
Actually im pretty sure that is wrong. I believe the order from most advanced (least power for most light output) to least advance goes like this:
XM-L (most advanced)
XP-G
XP-E
XT-E (least advanced)
So actually XT-Es are the least advanced, however they are the most used by reefers because they are the only type that come in Royal Blue.
XM-L (most advanced)
XP-G
XP-E
XT-E (least advanced)
So actually XT-Es are the least advanced, however they are the most used by reefers because they are the only type that come in Royal Blue.
Chris Lakies
Active member
Here is some info from the intranets.....
The XP-E has a pretty typical smooth curve, where the output tapers off at a predictable rate as you start to go off center. The XT-E keeps a higher average intensity over a wider angle. This equates to a little more even light over a larger area than the hot-spot characteristics of a typical LED.
When talking about light output, the first thing to note is that Cree is rating all their newer generation LEDs (XT-E and XM-L, among others) with a die temperature of 85C. Originally, everything was rated at 25C, and became an industry standard. Unfortunately, 25c die temperatures are not very practical outside of the lab, so Cree, and a few other manufacturers like Philips Lumileds started to use 85C as the benchmark point. This is a lot closer to real world conditions, and a much better predictor of performance. As a result, you need to do a little more work when comparing the light output of the XT-E to the XP-E. Rated output for the top bin XP-E at 350mA and 25C comes in at a minimum of 500mW. To bring it to a level playing field with the XT-E, the output is derated to approximately 460mW (estimated to be about 92% of the rated output based on the data sheet). XT-E top bins are currently rated to 550mW at 350mA and 85C. Now that things are apples to apples, that’s a 19.5% increase in output at the same current. Not bad.
Electrically, things improve again. Cree is gradually forcing the forward voltage down on their LEDs, which helps to increase efficiency, reducing driver requirements, or letting existing drivers run more LEDs in a single string. While most incremental LED updates bring the forward voltage down a tenth of a volt or two, Cree has managed to get the forward voltage of the XT-E down 0.35v over the XP-E. That’s a pretty considerable drop. The current XP-E has an average forward voltage of 3.2v at 350mA, while the XT-E has managed to get it down to an average of 2.85v. Keep in mind that these are average voltages and your experience may vary. As a result, this makes for a 12.3% increase in electrical efficiency at the same drive current. And you know what that means; less heat.
The last thing to note about this LED is something that a lot of people overlook; thermal resistance from junction to solder point. Most people don’t need to really look at this, as the heat sinks that are used in most DIY projects are vastly overkill, and can easily keep die temperatures in check. It’s still interesting to note that Cree has managed to increase the ability for the LED package to get heat away from the die by almost a factor of two. Thermal resistance for the XP-E is 9C/W, while the XT-E is down to 5C/W
The XTE is the newest advancement in tech.
The XP-E has a pretty typical smooth curve, where the output tapers off at a predictable rate as you start to go off center. The XT-E keeps a higher average intensity over a wider angle. This equates to a little more even light over a larger area than the hot-spot characteristics of a typical LED.
When talking about light output, the first thing to note is that Cree is rating all their newer generation LEDs (XT-E and XM-L, among others) with a die temperature of 85C. Originally, everything was rated at 25C, and became an industry standard. Unfortunately, 25c die temperatures are not very practical outside of the lab, so Cree, and a few other manufacturers like Philips Lumileds started to use 85C as the benchmark point. This is a lot closer to real world conditions, and a much better predictor of performance. As a result, you need to do a little more work when comparing the light output of the XT-E to the XP-E. Rated output for the top bin XP-E at 350mA and 25C comes in at a minimum of 500mW. To bring it to a level playing field with the XT-E, the output is derated to approximately 460mW (estimated to be about 92% of the rated output based on the data sheet). XT-E top bins are currently rated to 550mW at 350mA and 85C. Now that things are apples to apples, that’s a 19.5% increase in output at the same current. Not bad.
Electrically, things improve again. Cree is gradually forcing the forward voltage down on their LEDs, which helps to increase efficiency, reducing driver requirements, or letting existing drivers run more LEDs in a single string. While most incremental LED updates bring the forward voltage down a tenth of a volt or two, Cree has managed to get the forward voltage of the XT-E down 0.35v over the XP-E. That’s a pretty considerable drop. The current XP-E has an average forward voltage of 3.2v at 350mA, while the XT-E has managed to get it down to an average of 2.85v. Keep in mind that these are average voltages and your experience may vary. As a result, this makes for a 12.3% increase in electrical efficiency at the same drive current. And you know what that means; less heat.
The last thing to note about this LED is something that a lot of people overlook; thermal resistance from junction to solder point. Most people don’t need to really look at this, as the heat sinks that are used in most DIY projects are vastly overkill, and can easily keep die temperatures in check. It’s still interesting to note that Cree has managed to increase the ability for the LED package to get heat away from the die by almost a factor of two. Thermal resistance for the XP-E is 9C/W, while the XT-E is down to 5C/W
The XTE is the newest advancement in tech.
Last edited:
firechild
Premium Member
Wrong in a few ways.
XT-E are the latest release and while less efficient than XM-L or XP-G they are similar efficiency to XP-G with much lower cost (about 1/2). XT-E and XP-E are both available in royal blue (along with XR-E). For cost v performance, XT-E (which are available in royal blue and white but not blue) are the best choice for both commercial and DIY builds.
joelespinoza
New member
Then I stand corrected, thanks.
For my money I am kinda all about the Luxeon ones these days. They seem just as good if not better than my CREEs.
For my money I am kinda all about the Luxeon ones these days. They seem just as good if not better than my CREEs.
