4 emitters tested: Cree XP-E2, JR 3535, small die Nichia 219B, Luxeon Rebel lime colour

sorry I did not answer your question, I understand that DrJones' lecture made it more clear?

> dedoming (if at all succesful with Rebel leds)

I put four of the amber PC Rebel (10mm square boards) into SK68s and #3 zoomies.
One of the four I accidentally dedomed without even noticing it, probably a momentary shake of the soldering iron tip.

It came right off — found the dome later — and left a very clean emitting surface that zooms/floods a bit better than the domed ones.

Thanks Djozz. This thread slipped by me.

I gotta say. That is a lot of lime you got there. :D

Thanks for doing this great test. That Lime emitter looks really interesting!

Don’t you watch TV? These are used for hunting ghosts and bigfoot. :stuck_out_tongue:

Thanks Hank, this is good to know.

I’ve been a little hesitant to attempt dedomes with these somewhat pricey colored LEDs. Sounds worthwhile, although I’d be looking at deep/photo red right now and lime green, so it’s not exactly the same thing… but it sounds like the dome wasn’t really on there that securely from what you say.

Are you joking or do they really use lime green on the TV shows? I’m just curious. EDIT: for clarification I have not seen the TV shows, so I don’t know what it looks like. That’s why I’m asking!

Sometimes what one sees is from a camera using an NVD - Night Vision Device - which renders the captured colour a sort of greenish monochrome. It would not be said to be lime though.

I’ve edited my post to add clarification. I see now that I was really very unclear, sorry! I can recognize the footage you describe for what it is. I just thought that maybe powerful lime-green flashlights were in style for ghost hunters now or something. I have not seen those shows or previews or anything.

Nice review!

Here I added the XPE2 for comparison:

Thanks Djozz!!!

Love the comparisons!
So the NIchia is doing a pretty good job!?

Now looking forward to your new XPH test from intl.Outdoor.!!

It is said that if you had two objects (one red and one green) that appear to have equal brightness in daylight, at night the green one will appear much brighter.

Yes djozz. It did. I tend to forget enough of these things over time that I am unsure what was meant.

great work as always djozz. i was just wondering about benefits on dedoming, and i think u should see an increase in throw with an successful dedoming

When I accidentally flicked a dome off, I’d probably gotten the whole little square board quite warm while trying to solder wires to it.
Not enough to change color or look burned but odds are the dome was thoroughly warmed before I knocked it off.

(I was putting the little 12mm square Luxeonstar boards into #3 zoomies and SK68s, likely with very little heat being conducted away, when I did that)

Great topic.

No wonder why Nichia is the leading led producer from the beginning

Nicha has one big issue here in EU, considering price vs industrual quantity: its price, price vs quality/quantity needed and price/actual working conditions , which in real life aplication never ever passes 1 amp, even 700ma( when talking about that kind of emitters 3-5w)

XTE is better than XPE2 btw , and at lower price atm too

I never tested XT-E's..

True, but it worths mentioning as its a very good emitter for general lighting, and considering the fact that it can be found extremely cheap in EU( cause we have 2 Cree fabs in Europe) its even better
For bigger quantities( 1000+ ) the XPE2 and XTE price is virtualy the same

In the flashlight arean it wont be good…cant be dedomed properly :bigsmile:

For me, 219`s ultimate advantage is the fact that its the only emitter that i have seen and tested with a real R9( CRI) over 80…yet, its price usualy prevent us to use it

The colourful Rayus uses a blue XT-E, but XT-E's are not much used in flashlights, even not in the cheap chinese flashlights.

I presume that for the colour dies, Cree (and for that matter Philips, or Osram) uses the same die for the different packages, differences being not so much determined by the package but that newer leds have updated dies.

How does one distinguish between a small and a large die Nichia 219B?, in listings and also when I have my hands on it. Does the large one handle similar currents to an XM-L?