Good one Bort. I liked that.
Wow! You must hate the tint even more than I do!
I swapped the emitter in my S10. I don’t have an S20, but it looks to be of very similar construction. to access the emitter:
(1) use one of those rubber jar opener pads from the grocery store. Put the pad on the palm of your left hand. Hold the light in your right hand while pressing the bezel very firmly against the pad in your left hand. Twist. The bezel should come right off.
(2) With the bezel removed, insert a battery into the battery compartment. Push on the back of the battery. This should push, the lens, reflector and pill right out. The reflector is screwed into the pill.
(3) Use tweezers to remove the plastic isolator / centering device from around the emitter.
(4) The star should now be easily accessible. Replace the emitter with one of your choice.
In my S10, I tried replacing the very greenish XML with a different cool white 6000k XML (looked very green, even though the exact same emitter in a different light at 2.8 amps produced a beautiful pure white beam), neutral white 5000k XML (still didn’t look good due to low current. Everything looked yellowish), a 3000k XML (everything looked orange), a 5000 XPG2 (still yellowish, but more throw), and a Nichia 219 (finally perfect tint… but not very bright).
I think one problem is the Olight just pulls fewer amps than what I’m used to. The later Cree leds tend not to look very nice at low current.
It’s the driver that causes the colour change as it doesn’t use PWM, both a pro and a con. These drivers cause colour change in lower modes, so just about any emitter will produce a coloured tint on low mode. Replacing the emitter may not resolve peoples complaints on the tint, unless as in your example they use a Nichia.
I’m wondering how an XP-G2 would work out. Foursevens lights seem to have gone from green to white since they switched to XP-G2. It’s just matter of how the beam profile would be affected with the XM-L reflector.
Overall I don’t have a real problem with the tint. I mostly use it on high outdoors, or for peering into a dark trailer or car engine. White wall and real life are two different creatures.
I modded my S20 with T6-4C from FastTech. If you have retaining ring plier there is no problem to remove the bezel ring. This is now one of my favorite EDC flashlight.
Is the base 16mm, or did you reflow? I didn’t measure it, but it looked much smaller than 16mm.
The original led base is 14 mm. I used 16 mm without the problem, but then you can’t use the original plastic centering and insulating piece. Insread of the original one, I used this part from fastTech:
Well it just so happens I got a bunch of those from FastTech today, along with some 16mm XM-L T6 4C.
Did T6 4C swap improve the tint issue? Or is it now too yellowish due to being under driven (as reported in one of the previous posts) I was planning on buying the S20 but the green tint issue would be a deal breaker since I usually prefer a NW.
How bad was the greenish tint on the higher modes? (with the original emitter). I read elsewhere an S20 owner stated on the low settings it’s greenish, but on the two higher modes it has a nice white beam without any green. Maybe he was a lottery winner. I also read where an S10 owner had the same complaint and swapped for a T6 3C and now loves it.
I never swapped an emitter before but I have done some soldering on circuit boards (not flashlights) so I’d maybe give it a try if it’s not a total PITA and I knew the results were going to be worth the time and cost of doing it. (I can get the S20 for $39.99) I really like the S20 price and form factor, next choice may be the Sunwayman C20C for $58.00 it’s a comparable size (1mm shorter and 1-2mm thicker) but it’s not available in NW either, and no tail magnet 
Even as sickly green as mine is, I feel it’s a good value. I will try changing emitters as soon as mine arrive, so I’m very interested as well.
Did you ever get around to putting these in your S20?
I stuck an XML2 5000k NW emitter from Illumination Supply in my S10. Beam isn’t green, but it isn’t exactly white either. It’s yellow.
I think the problem is that the light is so low powered compared to what I’m used to that max power on the S10 is like medium power on my other lights. Since the S10 is current controlled, that means considerably less white tint even at max power.
So you have tried both an XML T6 5000k and also an XML2 5000k? I wonder if the S20 is a different driver than the S10, whereas the emitter swap produces better results. At least one user reported an improvement:
Also I see you tried a Nichia 219 but it wasn’t very bright, since from what have been reading the N219 is always dimmer than XML I wonder how the output of this with N219 compares to say an L2 L10. Maybe this would be a good host for an Nichia 219 build?
What emitter did you end up leaving in your S-10?
Waiting for an update from Ouchyfoot after he tries the emitter swap on his S20.
Are my eyes playing tricks or is that a copper MCPCB ?
I haven’t done any swap yet. I might not. The tint hasn’t really bothered me at all. Its not that bad. I mostly use it on high for purposes that tint is not relevant. If I want an outdoors torch, I would just use one of the many I have for that purpose.
If the tint shift is cause by an under driven LED, an XM-L swap would just produce more of the same.
Maybe an XP-G2. But I have no idea how the beam profile would look using the factory XM-L reflector.
Thanks, it sounds like Firelight has tried just about every emitter in his S10 (including XPG) to no avail.
I think the driver would push an XP-G2 nicely.
In my S10, I tried:
XML T6 5000k neutral
XML2 U2 cool white
XML2 5000k neutral
XPG2 5000k neutral
Nichia 219 4500k High CRI
I ended up going with the XML2 5000k neutral. For awhile I was using the Nichia 219, which gave great tint, but very little light (my guess around 120 lumens or so). The XML2 produces far more light and at 5000k the neutral tint is pleasing enough. It’s still nowhere near as good a tint or color rendition as the 219 or my more highly driven XML and XML2 lights, but is much better than stock.
There’s a very noticeable brightness increase going from XML 5000k neutral to XML2 5000k neutral, but the yellowish tint is the same with both emitters.
I have some neutral XML-2 emitters inbound; I might have to try that. Yellowish I can live with, but mine is SO green I just can’t get used to it. From what I’ve been reading some are worse than others, and I probably just lucked into one of the worse ones. I really can’t complain too much. I’ve been really lucky with as-issued tints so far, even with the Four Sevens minis that a lot of people complained about.