[Update]Wurkkos dual LEDs 21700 Headlamp design Photos/UI update~

Commercial Sellers' Spot
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+100

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I’d really like to see high-CRI for both emitters, at least as an option. The high-CRI emitter is one of the reasons the FC11 has become my default recommendation to newcomers.

The SST-20 4000K is a very practical throw emitter even if it doesn’t make huge numbers, and Wurkkos is of course already familiar with the LH351D, an excellent choice for a flood emitter.

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I agree! 5000K and 4000K is what we need.

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If the clip is sturdy enough amd the price is right, it sounds like a winner to me. Preferably a clip like the FW3A, so it won’t detach.
Nice light!

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Im interested to hear a release time.

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Not sure about the other two colors, maybe will try the desert tan only small quantity :nerd_face: the blue color seems not the one we need as the design

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Any idea of the release date?

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Yes, as the picture show.Still not assemble the desert tan just a host now :smiley: other specs will update soon, thank you.

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@MacLee:

Mark, I took the liberty to visualize the draft UI you posted in post #1, see below.

Some thoughts and questions...(sorry for this much text but I try to list up everything that came into my mind)

  • Do you have any plans to include a ramping mode in HD20's UI? The stepped modes look fine so far. I would recommend a good mode spacing between low, medium, high and turbo. If you consider using the moonlight mode as a totally separate brightness level, I would suggest a mode spacing like 5lm (low), 150-250lm (medium), 600-800lm (high) and 1.600lm (turbo) for spotlight and 5lm (low), 80lm (medium), 250lm (high), 600lm (turbo) for floodlight. Please try to use a sublumen value for the moonlight mode, i.e. 0.5lm would be nice. High mode should be sustainable without any stepdowns.
  • If possible in terms of efforts and material costs, please try using a thermal stepdown regulation instead of a fixed timed stepdown as in FC11. In cold ambient conditions HD20 could run on turbo mode much longer. Sofirn has recently introduced new thermal regulations (ATR) in their new drivers (e.g. IF25, IF25A, SP33 V3). They should be able to use the driver's NTP for thermal regulation unless HD20's driver is a complete new design.
  • I vote for black and desert tan as anodization colors. The blue color looks somehow a bit cheap and less appealing, especially for a headlight someone would mount onto the forehead. :-) The "army green" tint could be an intriguing look, though. If you still intend to sell a blue version, I would be careful with the lot size to avoid excess stock.
  • I fully agree with the majority here to avoid any CCTs > 5.000K. Any tint between 4.000K and 5.000K is fine. If you can, please avoid AR coating on the optics/lenses for the floodlight (LH351D). It has come to BLF's attention that this LED somehow produces greenish tintshift with coated glasses. If the floodlight optic uses a pebble design for light diffusion this problem will probably not appear anyway.
  • In terms of the headstrap, please check for a better headstrap than the one Sofirn used for SP40. The cheap rubber mount of SP40 gave me a hard time to handle, fiddling the flashlight into and out of the mount. The headstrap should also include an overhead strap in the middle to improve weight distribution upon the head, especially with a weight of 160g.
  • Regarding the USB-C output, please try to incorporate the latest charging circuit revisions that Sofirn used for their LT1 lantern. These changes include two small resistors that enable the USB-C port to be used with type C to type C cables. Without these revisions HD20 can only be charged with type A to type C cables between charger and flashlight. This is nothing mandatory but it has the potential to become a minor nuisance when type C cables will become more common in the next years.

Concerning the UI in particular...

  • What LEDs will run using the strobe modes? Flood, spot or both?
  • What LEDs will run using the moonlight mode? Flood, spot or both?
  • What will actually happen when the battery check is initiated? Will the LEDs blink out the voltage (e.g. 3x short blink, pause, 8x short blink = 3.8V) or will the switch LED indicate the approximate battery status by different colors?

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needs to have a quick disconnect headband mount

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If we talk about the colors that the flashlight will have, in my opinion the dark gray color seen in this image would be ideal, better than the black of the real photos that you passed later.

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It’s huge… 100 (body) +68 (cell) +12(mount) -> 180 grams :open_mouth:

I think, that it’s time to stop adding the headband to the angle light, and calling it headlamp… Please :question:

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Thank you,Lux-Perpetua. That is awesome drawing of the UI.

What LEDs will run using the strobe modes? Flood, spot or both?——both. strobe modes change by double click.
What LEDs will run using the moonlight mode? Flood, spot or both?—for now it is floodlight about 0.5-1lm.
What will actually happen when the battery check is initiated? Will the LEDs blink out the voltage (e.g. 3x short blink, pause, 8x short blink = 3.8V) or will the switch LED indicate the approximate battery status by different colors?—-the switch LED indicate different colors

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:person_facepalming: :person_facepalming:

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I agree with DominikM with this one. I used the PL47g2 hiking and the weight is noticeable and that is only around 150g.

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Same here, a huge reason I think Zebra’s headlamps are worth the price (and better than some competition) is their extremely light weight.

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Driver? FET PWM both channels? No stabilization? Charger 500mA? ;))

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The goods news is that this light is planned to come with an overhead headstrap, as far as Mark told me today. This overhead part should give more support for weight balancing and distribution. For reference, a headstrap comparable to this one...

Acebeam's H30 is also quite heavy and big in size but I don't know how well their sales were running for this light. Did many people complain about PL47's weight? What headstrap did Fireflies supply with the PL47? Maybe we can use some best practice here to get a better product. ;-)

I hope Mark or I will soon be able to get to tell the interesting specs about the driver. What I was told so far...

  • Type C charging unit incl. reverse charging (= "powerbank feature")
  • Sofirn's in 2019 revised ATR (advanced thermal regulation) with a 50°C threshold

Please note that the UI is still work in progress. Mark and I have talked a lot today on how to improve the UI for more convenience and flexibility. My plan was to remove the entire strobe modes (I hope everyone here agrees to this point of view) as strobe modes are proven to be quite ineffective against assaults by human beings or animals and often considered as a nuisance in BLF flashlights, especially in a headlamp. However... there are reasons to keep strobe modes and so my suggestion was to put strobe modes in a hidden section of the UI and leave more room for direct access to turbo mode from ON and OFF. We also try to improve the access to moonlight without getting into conflict with the nice powerbank feature while reverse-charging an external device.

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I thought the PL47 was completely useless as a headlamp. I have one, the original, and use it more like an EDC. I recall lots of criticisms. Funny, the Amutorch E3 is very light for a 21700 light, but of course it's not a right angle head.

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Yes, if strobe is no need , ad the most important is that access to instant moonlight and turbo, we will probably give up all strobes modes ( strobe, SOS, beacon) :arrow_right: