You can use the webplotdigitizer to check the total surface area between 119 and 219 package. But high performance non DTP MCPCB or non isolated MCPCB must be used.
- Clemence
Another improvement in 119/219D is its thermally more stable. From –30C to 25C the output remains almost the same. Less output reduction in higher temperature too.
- Clemence
Happy surgery! 
UPDATE 180702:
Full range CCT (2700K, 3000K, 3500K, 4000K, 5000K, 6500K) Optisolis added to the store. All 3 steps MacAdam.
The VR21P4 (Optisolis/757 series only) and VR21SP4 (E21A only) already shipped to Indonesia today.
- Clemence
New Products:
VR21P4 (parallel only, 757/Optisolis only)
- The closest performance to DTP copper MCPCB.
- 1 Oz copper
- Diameter = 21mm
- Thickness = 1,5mm
- Compatible with Carclo 106xx
- Almost invisible (from afar and when lit) yellow marking for enhanced aesthetic
- Special solder footprint dimensions for precise LED positioning. Very easy to solder with DIY techniques. No more overflow solder - bumps which can impede optic placement.
NOTE:
Ignore those erroneous guide boxes, they won’t affect the board/soldering performance. The LEDs self align perfectly.
This board is sure overkill for 757 LED family, the board thermal resistance is much lower than the LED thermal resistance itself. But with some scrapings here and there this board can be used for other high power (2 pads) LEDs as well.
NF2L757GT-F1 sm273 P9 Rfh00
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VR21SP4 (larger version of VR16SP4)
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P7080621_DxO by Clemence Ronald, on Flickr!
New features:
- The closest performance to DTP copper MCPCB
- 1 Oz. copper
- Tighter LEDs spacings at 0,3mm
- Smooth backside
- 2,5mm holes can be tapped for M3x0,5 screws for alternate mounting options with thin heat sink plate.
- Diameter = 21mm
- Thickness = 2mm
- Almost invisible (from afar and when lit) yellow marking for enhanced aesthetic
- Clemence
Nice! I like the good circuitry clearance around the mounting holes!
So you can use ultra low profile (thin) flat heat screw up to 5mm head diameter. Easier to countersunk too, without having to break through the super hard ceramic.
- Clemence
Do you recommend any driver or host for the VR21P4 and VR21SP4 to be used with? I’m thinking using the D4 as host for the VR21P4 but the driver will kill it in an instant. Will the VR21SP4 fit in the Convoy S2+?
For a Convoy S2, I think, a VR16SP4 should be fine instead of VR21SP4 (didn’t try OP reflector of the XM L2 version of Convoy S2, a TIR lens will work there for sure, I think).
For a host, which is compatible with Carclo 1062X series optics (thus, VR21P4), I received a recommendation, which mentioned, that kiriba has a spacer for Convoy M1 host. Would be happier, if there would be a host with out-of-the-box support for 1062X optics and any MCPCB, which fits under it, though.
Uhmm, I’m a noob when it comes to flashlight vocabulary. What I know is driving these Optisolis beyong 500mA/ LED is not a good idea if you care about lumen maintenance. You may laugh, but I only have one Convoy 18350 and that was a Djozz-lumen calibrated flashlight that I don’t want to open.
- Clemence
Clemence, what do you mean by lumen maintenance?
Cook the LEDs too hot, and they lose efficiency over time. They “wear out”.
Correct, Djozz reported a loss of 0,5% initial output after 40 continuous minutes at 500mA.
- Clemence
Any idea what’s the L70 rating on those LEDs?
It’s still so gradual most people probably wouldn’t even notice, but…
Optisolis designed for 25.000 L70. So far only calculated estimation available because it’s still undergoing the test. I predict it will reach 50.000 hours minimum judging from how well they can be overdriven.
- Clemence
Speaking of heat, an optisolis at 1amp is by far cooler that a 219c at 5, so I am still confused
Of course.
The die itself can’t handle so much power.
Of course the Optisolis will be cooler.
It’s about 3W of max power vs 20W.
Thermal resistance: Optisolis = 21-27 C/W vs 219C = 4,2 - 6,4 C/W.
Substrate: Optisolis = polymer based vs. 219C ceramic based
Optisolis might felt cooler outside but deep inside the die, it’s hotter than 219C (same wattage)
- Clemence