As you know the color temp is just the color of the light from the LED. Although it gets more complicated then that as you can have many differnt hues toa given tint (green, red, yellow, blue ect) it is still pretty basic.
CRI is how close to sunlight the light produces color. most LEDās are 70cri or less and colors look flat and dead.
80cri is 80% of the sun and is what you generally see in LED and florescent household lighting. It is a good mix of output and color.
90CRI is 90% of the sun and produces nicer colors at the cost of lumens.
The flux bins are simply how bright and efficient the LED is.
In the case of the XHP70.2 the P2 is the highest output bin, It then goes N4 - N2 - M4- M2 - ect.
Each bin is around 7% brighter/dimmer IIRC and Cree has a 7% tolerance for each bin as well (convenient wouldnāt you say).
So what this means is that some LEDās will simply be brighter then others and vice versa and there is no way to know until you try them.
You also have to factor in forward voltage. For example the 80cri LEDās have a much lower forward voltage that helps them make the big lumens they do even though they are a lower bin.
Check out this link and download the data sheet. http://www.cree.com/led-components/products/xlamp-leds-arrays/xlamp-xhp70-2
You will start to see the patterns. Every led is tested with a set voltage and current and Cree reads the color data and brightness. It is then divided up into several groups to be sold.
Oh, I also wanted to let everyone know that I requested Terry hold off on sending me the MT09Rās he is sending to me until Monday. I will not have time to work on them until middle of next week anyways and this gives everyone a little more time to jump on board before he ships them to me.
The more we can keep things in larger orders then a bunch of small ones the simpler it is for all of us.
He has the lights now, I just simply wonāt have time to work on them as the lights I have on hand now will take all my spare time until this weekend I am sure and early next week I will be busy with other stuff.
Speaking of which, 1 or 2 more packages showed up today but I have not opened them up yet to see whos they are.
So an N2 bin has 7% less output than an N4 bin āgenerally speakingā. You would think each bin would have a tolerance of + or - 3.5, but it doesnāt. Itās + or - 7 or 14% total! :confounded:
Here are common 70.2 bins and their lumen range at 2.1A, 6v and 85Ā°C.
With such a large tolerance you can see where an N2 might fit in the range of a M4 or N4. Itās a wide tolerance of 14%.
So an N2 could be anywhere from 1540 to 1760. Basically anywhere from its normal range to the upper half of the bin below it to the lower half of the bin above it.
For example, from 20,000 lumen to 23,000 lumen is 15%. So you could see such a large swing in output from a single bin. (assuming all 3 emitters in one light were on the bottom end of the tolerance and the other 3 were at the top end of the tolerance. This is pretty rare, though. Itās usually in the middle somewhere)
It is only when using FET drivers that forward voltage has a big effect. With most factory drivers the forward voltage has little to no effect at all. I donāt think the 80cri has a higher efficiency, either. It gets its higher output from drawing higher amps which produces more heat and drains the batteries faster. Correct me if Iām wrong TA. The forward voltage stuff is a bit hard for me to understand.
I made a mistake, I meant to say Terry not Dale lol.
I will watch for your light, I know I have several showing up in the next few days, gonna try to knock them out by this weekend before I start on another project that will take my time for a few days.
Very possible, I will go through the mail after I finish SVK89ās last MT03. I have had his lights long enough and want to get them shipped out tomorrow.
Yes, that is more or less correct, there are some highly technical things that can effect it but not enough to matter in 98% of situations.
Higher CRI emitters generally have lower forward voltages in order to keep efficiency up to par. In this case it can handle the extra power so that helps a lot but yes, it will get hotter then the same light built with P2 emitters.
They both get hot so fast I doubt most would notice the difference though lol.
Great info thanks!
Of the three, which one can use turbo the longest? Iām suspecting the x45 due to the largest head? And which one has the most throwā¦.mt09?
Okā¦ if I want to order and modded where do I start? Do I pm someone or go ahead to the site and order it then pm? and can you do some night shot comparison of different lights and the modded MT09?
I might just get this one and called it the final flashlight Iām going to buyā¦ until I see a 50k lumen fairly compact handheld cannon (yes I set the numbers high so I donāt go and buy another new light (with good UI/CRI) thatās capable of doing 22.1k lumen lol)
Ok, I just got SVK89ās final MT03 modded, this one is the best of the bunch, it is doing just under 23k lumens also with the 4000k 80cri LEDās.
Goes to show how the LED lottery can work, 3 lights with the exact same work, same driver and the LEDās are all from right next to each other on the reel yet a range from 21k to 23k lumens. Just no way to predict it.
I will get SVKās lights packed up and shipped tomorrow.
Gotcha, Terry, Not Dale. I think I read that Dale was at the doctorās with his daughter? Hope sheās doing alright, and that itās nothing serious.
And thanks for trying to get to my light!