Has anybody seen a video or pictures of side by side beam comparison of XHP70.3 Hi R70 and XHP70.3 Hi R9050?
R90 are almost always green. R70 are (at least the bins Simon has) usually not. The rest is just your usual R9050 vs R70 color rendering differences.
If you want a good R9050, grab the 5700K R90 from Simon. Neutral to very slightly green. I have it in a SP33S. I prefer the 4000K R70 in my M21B though.
3 Thanks
This is the one that I am ordering, but in M21E host (I like more throw). XHP70.3 HI R70 4000k seems to be praised by a lot of owners for great color rendering with the least amount of green tint.
Color rendering isn’t great, it is a R70 LED after all. But the beam is pleasant. Outdoors I need no R90, I mainly need efficiency.
Would it mean that 5000K R90 from Simon wouldn’t be as nice as 5700K?
Not the person being asked, but from what I’ve read this seems to be the case.
As a general trend it appears that among R9050 LEDs, the 5700K CCT tends to have higher CRI and better tint than lower CCT counterparts. Examples: the Nichia 219C 5700K occasionally tests at 80 R9, the LH351D 5700K is generally more neutral and I’ve seen one land 97CRI, and similar story with Cree XHP’s.
I can understand why the tint is better: at high CCTs above 5000K, green becomes less noticeable, and the standard reference spectrum becomes a bit green too. I don’t understand the higher CRI though.
1 Thank
I can say, that every 90 CRI XHP70.3 HI from Simon was green. 5000 K, 5700 K, 6500 K - doesn’t matter. Every was over duv 0.003.
Maybe there are some samples with good duv, but I never got any of them.
2 Thanks
That’s great! Do you know if any of the R70 tints (XHP70 or XHP50) have also green hue or at least neutral?
Some months ago 4000 K 70 CRI from Simon had great tint (slightly rosy). The low color rendition is visible though, especially in direct comparison to high CRI emitters.
xA and xD tints (like 3A, 5D and so on) are almost always below duv and never green, xC and xB are guaranteed to be above duv and therefore green.
Yes, my friend, i 've seen the diagrams. I don’t know if Simon has these flavors.
Simon shows bin codes of his xhp70.3 and 50.3 emitters. Check out his store.
Everything is listed on his website:
1 Thank
How to decipher those codes?
For the R70 we’re talking typical Cree bins, there are four available: 1C, 3A, 5A, 7C.
For the 3A and 5A you’re pretty much guanateed to be below duv and therefore no green tint.
As for the 90CRI we have 50G or 40G - first two numbers is CCT (50 - 5000K), G means 2-step binning as shown here:
As you can see most of the red circle is above duv therefore green tint is fairly likely.
3 Thanks
Very useful diagrams. Also, i see Simon has nice green tints in Cree 3v XHP50.3, which is very interesting. Also, the XHP70.3 6500K R70 is 1C.
If there’s one thing I’ve learned about LEDs in the last 10 years, it’s that the bins don’t tell you anything, but will always have series variation and can also lie outside the specified ranges. For me, color bins are merely pointers to where good tints could be expected.
Like my LHP73B with duv 0.0021, which is clearly above BBL and is also visibly less rosy compared to rosy tints, although the specification to LMP was “negative duv” (“below BBL”).
There are only very few manufacturers who deliver consistent good tints (in most cases), like Nichia. However, even they delivered LEDs with a strong green tint. Then as now, it used to be, for example, a 219C with duv over 0.005, which I found in an M43 Meteor…
As Simon said it’s binned LHP73B-B0-3B-J4-VU, so “3B” color area, above BBL.
I think this is true for custom variants of the emitters, while 5000K, 6500K (5700K) of LHP73B and 6500K (5700K) of LHP531 were purchased in their usual “configurations”.
So “non-greenish” in the item description from his website is technically not true. (Yes, the tint is still ok, but “non greenish” is below BBL for me)
1 Thank