Recent content by Harold_B

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    SFT-10/20 Green Availability

    I’m assuming the Luminus Devices LEDs are intended for projector applications (shhhh, I’m at work....) so perhaps you might consider the Osram OSTAR Projection Compact LE CG Q8WP-8N7P-1 to replace the single die, and LE CG Q7WP-6Q5R-1 to replace the two die product. They have ~10% less rated...
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    Yuji LED representative

    Daniel - sent you a PM regarding strips.
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    Using projection of square LED die image as a rangefinder

    Sure, within a range of accuracies. Im not sure if the projected image would stay crisp for very far to get an accurate estimate of the size. Assuming that the image is good enough what is really needed is the divergence angle of the beam so that the image is the right size. Calculate the...
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    2000 Lumens?

    I've measured bicycle headlights that were apparently rated in scotopic lumens without specifically stating the fact in the spec sheet. Perhaps that's how this flashlight is being measured. The bluer (cooler CCT) the light more difference it will make. Just a thought....
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    Zebralight MKIII projecting image of emitter dome ???

    I think what you are asking for is reasonable although I'd imagine most manufacturers would have to send their products to a lab for certification. Major manufacturers likely have similar equipment but these start at around the $70K mark give or take a bit depending on options. Your iPad app is...
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    Zebralight MKIII projecting image of emitter dome ???

    It is your money and you should be satasfied with your purchase that is for certain. I have no idea how the engineers at Zebralight go about designing their reflectors or if they outsource that part of the project but designing for color uniformity from a specific LED source isn't trivial. it is...
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    Zebralight MKIII projecting image of emitter dome ???

    I haven't seen this topic pop up in a while but it's not new if I understand what I'm seeing correctly. First off, I don't have a Zebralight MKIII CW at hand but looking for specs I gather that it's using a Cree XML2 and a CPC optic. Is that right? If so then I would be surprised if you didn't...
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    measuring lumens with a cheap meter

    Measuring the output from a flashlight is not as easy as it sounds. I had offered to measure a prototype for a Kickstarter light and it was a pain (especially the moonlight mode). There are a lot of considerations going into a test including the calibration of the sphere/spectrometer. I ran the...
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    Reverse aspheric with sapphire cover

    If I understand correctly you want to flip an aspheric lens so that the high curvature surface will face the source? If that's the case then you will likely miss out on a lot of output from the high angle rays being emitted from the LED. Full Width Half Max (FWHM) of most LEDs is around 60...
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    Niwalker MM15 joined wells reflector design "questioning" !!

    Sorry I didn't get back to you on this. It does look like fun but I am buried with work and paying customers always come first!
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    Best unique designs, and features for flashlights in future?

    Adjustable color temperature with 80+ (preferably 90+) CRI via multiple LEDs with no multi-shadowing or color separation over the viewing angle. Adjustable focus without imaging the LED die. This would likely require at least a three lens system. "Smart" LED arrays similar to what is used in...
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    Looking for red LED light to replace old Gerber Infinity....

    You could also take a white light LED and put a filter on it. This thread talks about doing just that for warming up cool CCT LEDs. I've used them to make green as well. http://www.candlepowerforums.com/vb/showthread.php?320811-Changing-LED-Tint-With-Filters
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    Olight s30r II dark spot

    Would be the same with a parabolic reflector as far as focus. If you look straight into the reflector (with the LED off!) the reflector surface should look completely yellow from the center to the edge if the LED emitter is at the focal point.
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    Olight s30r II dark spot

    Are these all TIR optic or CPC designs? Either one will create a donut although the TIR is more sensitive in my experience and it's usually caused by the emitter being in the wrong location relative to the focal point. If the LED was updated sometime in the production lifetime then the emitter...
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    White film inside Surefire Kroma-Milspec optic?

    Looks like someone didn't clean out the mold machine very well after a run of white material. Definitely contact SF.
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