E21A 2000K-4500K tint ramping flashlight (IF25)

I previously modded a Sofirn IF25 with sliced LH351D , I wanted to get even more rosy tints so I decided to use E21As.

I used a Noctigon E21A MCPCB on which I separated each LED anodes :

With the E21A 2000 and 4500K reflowed on :

I added mounting holes because I thought the wire hole was too large on the IF25 to use the default ones, but actually I wrongly measured it and they weren’t needed :person_facepalming:

I removed three of the four current sense resistors (40mΩ each in parallel for a total of 10mΩ)to reduce the current :

Final current is 2.15A, should have been ~2.4A if it was like my other IF25 (9.6A with the 4 resistors), lower than I’d like.

I also changed the switch for a quiet one :

It’s a bit taller so I’m using a taller switch cap with it.

After soldering the wires :

With Carclo 10623 :

Since the original optic is taller, I added an O-ring between the optic and glass lens to make up for the difference, I cut some thickness away in front of each TIR lenses to not block the light.

finished :

Some wall shot at different tints :


Same but video :

(WB 4500K, left is LH351D 2700K above the BBL, right is sliced LH351D 5000K : 4200K on the BBL)

Color diagram :

Color rendering :

More color saturation in the middle.

So this is much more rosy than my other one with sliced LH351D which is mostly neutral and slightly rosy in the middle. It is very nice but the output leaves a bit to be desired, I could drive the leds to maybe 2.8A (1.4 per leds, max rated) with a 30mΩ current sense resistor (which I dont have :smiley: ), I don’t think they could be pushed much more on the noctigon MCPCB which has a rather thick dielectric layer. Virence Carclo compatible high perfomance MCPCBs when ? :smiley:

And ideally I would prefer a smaller light like a D4V2, but being a noob about electronic I can’t design a tint ramping driver for it.

Where did you order Noctigon E21A MCPCB from? I can not find it at intl-outdoor.com.

I emailed Hank directly, I bought some other non listed parts as well (leds, driver…), it seems like if you ask, he can sell you any parts used in his lights.

Wow super impressive!

That turned out really well!
This kind of modding is something I aspire towards, since I still haven’t got nearly enough knowledge of electronics to adapt a driver for lower-current emitters.

Great results and pictures as well.

I may attempt to replicate this mod but I would go with 2000 - 6500k

Thanks!

Well I’m not very knowledgeable about electronics either, but this is relatively simple : current is regulated by reading the voltage across a very low resistance resistor (usually a larger package), in the IF25 it’s not one but four 40mΩ resistor in parallel making a combined resistance of 10mΩ. Having measured the max current at 9.6A on my other IF25 it means the voltage across the resistor is V=0.010*9.6=0.096V. That voltage means max current, so to get a lower max current we need a resistance that gives the same voltage at the desired current (for example 2.4A) :

R= 0.096/2.4= 0.040Ω

So basically I just kept one 40mΩ resistor.

I got lower than that though maybe due to components variation, not sure.

Going for maximum rosyness I see :D, I only had as high as 5000K and since it’s much closer to the BBL than 4500K it wouldn’t have resulted in a lower duv mix. But also I think that more rosyness might be too much for me.

:beer: Nice project

Very impressive mod thefreeman and great write-up! :+1:

Very nice work, thumbs up!

This looks great, I’d buy one!