I built my first driver from scratch (well, from oshpark and a bag of parts) and it worked!
Even better, I got it to do 4-channel PWM for red, green, blue, and amber LEDs. With an e-switch to control it.
I had thought the 3rd PWM channel was weird, but no. The 4th channel is. The attiny85 doesn’t have direct support for 4-channel PWM (the hardware does channel 3 OR channel 4), so I had to do it semi-manually by chaining an extra interrupt off the PWM timer and using that interrupt to manually turn the 4th channel on and off.
Also, for some reason the 4th channel is inverted so 255 is off and 0 is full brightness. I’ll have to see about fixing that.
But anyway, woot! This means that soon I can start on the fun parts.
thought this would be a fun zoomie host to play with.
updated the stock triple color led to a single sst-40, driving it at 5.5A with a east-92 driver, powered by a littokala 26650.
I swapped 4x XP-L2 4000K 90CRI leds (from Mouser) into my black Emisar D4. A partly succes.
The jay:
unlike XP-L’s, the XP-L2 fits under the commonly used Carclo optics (tight but alright)
the beam is good. I have the XP-G3 version of this led in a Carclo triple and it has the intense yellow corona, the XP-L2 in combination with this type of TIR has a larger spot but also better blended tint.
the output is great. Despite this high CRI version being just a U6 bin, it puts out 4300 lumen OTF at start-up, 3800 at 16 seconds when thermoregulation (set at max) kicks in. The current draw is 14.9 A with a 30Q at 4.11V, same current as my D4 219C version.
The meh:
the tint is similar to the 4000K 90CRI XP-G3, so nothing rosy in there, on the green side of white. Still a matter of taste, the colour reproduction is good.
As a FYI, I also had a couple of 4000K 80 CRI XP-L2 leds from Mouser, bought a bit earlier, and that tint is simply wonderful. I tend to like them better in a flashlight despite the lower CRI.
Here is two white wall shots. Do not look at the actual tints, first because the pictures are made with auto whitebalance, and second my phone camera is damaged by UV-light so the center of each picture is brighter and slightly more pink than the edge :confounded: .
Left Carclo 10507 (S2+) with XP-G3 4000K 90 CRI, right Carclo 10621 (D4) with XP-L2 4000K 90 CRI.
ha, you reminded me that I have a glass lens from a project years ago! found it, and was excited to test it, but it did not work out well. the focus was lost mid way thru extending the tube.
the stock lens is in the middle and is not glass, it is the biggest lens of all my zoomies.
I like most everything on this host except for the pill, the thermal path needs a lot of work.
It has a nice wide beam and still puts out some lumens, not as much as a quad or triple but is has more “throw”. It pulls 8.45A from a fresh VTC6, settling @ a mere 3.22A after stepdown.
I also swapped the emitter in a Sofirn SP31 to a XP-L HD 5A3 :
As probably most of us I was always using 1D’s or 1A’s for dedoming. As I have replaced the 3D xp-g2’s in my Emisar D4 for 5D I had some 3D’s to play with.
I dedomed them and really like the tint. Put one in my otr i3 and one in my B158. Liking this much much better
Swap stock LED from Thrunite Ti3 with Nichia 219x from Fasttech. Pics taken using same setting and manual white balance, hopefully they show the actual tint colors.