Hank replied to me yesterday:
“ Yes, we can get the XP-E2, but it does not work with D4S V2 and D18, since the driver does not support it”
So I’m not sure if that means he can do 9 of these on CH1 and/or 3 on CH2? I’m thinking blue and green for sure
Hmm, channel 1 XPL-HI is taking a while to stepdown but channel 2 SST20 is stepping down fast.
Can’t set a thermal limit for each?
UV led has high forward voltage, maybe 365nm is possible at lower current, but lower wavelength which act on germ will usually need hiugher voltage (more than 4V), so we need a boost driver. The K9.3 use two linear driver. I hope somebody can do proper review of this flashlight on the forum soon.
The_Flashaholic I’m really looking forward for your k9.3 review!
I was wondering about this as well, as it seemed my red was going super bright and dimming down instantly. I thought it was just my vision lol
Red led have very low forward voltage. Because K9.3 use linear driver, the linear fet which act as a resistor will be burning all the power as heat. For example, if your battery is 4.0V and led is 2.7V, you are wasting 32.5% of power from battery as heat in linear driver. Most likely the white led channel heating up less since it has higher voltage. this is sadly the limition of linear driver. For red led probably buck driver is better, and for uv led probably boost driver is better.
I want to ask if someone who has K9.3 do a review for the driver in detail? I would like to see how it is design and how the performance is!
Worst thing you can do with linear is have high Voltage input and low Voltage output at the same time with super high currents, so the red LEDs and 9A is a heat generator at the MOSFET level, basically at the driver side.
Linear is actually great when the voltage discrepancy is small and the current is not massive.
Does anyone know if the LEDs of the K9.3 all sit on one board? I’m thinking of getting one but would want to swap the CH1 LEDs. I’d like to know just how hard that would be.
Might be best to ask Hank to put the ones you want on. I had him make me a custom D18 with a mix of 2700 and 4000 emitters and it was something like an extra 10 bucks
I just ordered a D4VS2 in deep red. It will be interesting to see how to compares to CH2 on my 9.3
Here’s an interesting one… on a whim, I ordered a black K1 thrower with the 4500 lumen SBT90.2. Should be cool to see
On the page, Hank recommends the Samsung 40T. I’ve been using 30T’s in my 9.3 and lately 50E’s for more run time
Would the 40T work in the 9.3 and give me the best of both worlds? High performance like the 30T and capacity that is better although not as much as the 50E?
Thanks
The 40T can be considered as the most reasonable compromise between performance and runtime. While the 30T (in theory) has a slightly lower drop in voltage in the first seconds on Turbo you probably will not notice any benefit from it afterwards. If you are a „lumen hunter“ to measure the peak output in the first 10s, go for the 30T. Otherwise, the 40T is the better option. Both batteries easily sustain SBT90.2‘s power consumption of approx. 20A.
The most promising battery will certainly be the new Samsung 50S which combines the power of the 40T with the capacity of the 50E. Unfortunately, this battery is hardly available right now. I hope Hank will offer it on his shop anytime soon.
This is great info. I picked up two 40T cells from Illumn recently, website said backordered but they were available right away.
I’ve really gone overboard with the K9.3, have ordered two more:
Everyday light is the one I will probably use the most, the 3500K E21A in my D4V2 has a really nice tint. Red on CH2 will be fun in the backyard, so I know I’ll like this light.
Pretty excited for the Night Hiker build, particularly because it had no price increase option. Was $118 shipped vs $134 for the Everday configuration. CH2 has more throw, so the cooler 5000K seemed liked a good fit. Nice warm 95 CRI 2700K on CH1. In theory, I think this will be a very functional light.
Have posted my first K9.3 (Green / Amber / CH1 E21A 2000K / CH2 W1 yellow) for sale elsewhere, so no one can call me a crazy person for having four of these things. Trying to keep things reasonable with just three. :sunglasses:
Preserves night vision. I’m a pilot AND an amateur astronomer. I like the idea of being able to use the red when I want to preserve my night vision then shift gears at the push of a button to light things up properly when I need to.
I ordered on the 29th and got my notification on Friday. I was getting concerned and emailed Hank, it shipped the next day. I’m thinking there’s some pretty good demand for this light.
The built in charger is neat but I’ve used it exactly once with my K1 and just to make sure it works. You have to unscrew it from the head to use the USB-C and it’s just as easy to remove the battery and pop it in the charger.
Just like the K1. 
I got my first hank light, a K1, with the 5D emitter and really loved the light. I got a D4V2 with them and also loved them. I got a D4V2 mule with the 3A emitters just to squeeze out a few extra lumens but 5000K is a bit too cool a light for my taste. But it really lights things up. A buddy got a D4SV2 with the 3A emitters and loves it. So it’s a matter of taste I guess. I would never want anything cooler than 5000K though. I want back to the 5D emitters for the K9.3 with red secondaries for reasons afore mentioned.
I too ordered on the 29th and mine shipped on Friday the 15th. I’m thinking he may have run out of 5D emitters because theyre not listed as an option on any of his lights rn.
Nah. you would be seeing jizz and cat piss everywhere and be grossed out.
Not really. All the UV LED lights I’ve seen and used emit light that’s in the 395nm range and you really need 370 and below to really light stuff up. Maybe one day though. TBH, never even thought about getting UV on Ch 2 but with the right emitter it would be cool. Maybe time to drop a bug in Hank’s ear and see what he can come up with.