Recent content by Xe54

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    Best high-CRI 3500~5000K CR123, AA, or 18650 powered EDC these days?

    Hi: Looking for recommendations. I seem to have broken most of my pocket lights. Down to just twisties. I need a replacement or 5 which has at least several levels ranging from 1~5lm to ≥200lm. My UI preference would be (from best to just ok): 1. adjusting ring, continuously variable from 0~max...
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    Spectrometer for CIE color coordinates, CCT, CRI?

    The software really makes a big difference. I'll check them out again. I've got too many projects... Even without a proper luminance calibration source, with at least a cosine corrected pickup it'd be great for accurate relative comparisons of lights. It's just occurred to me, that if one...
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    Spectrometer for CIE color coordinates, CCT, CRI?

    Yeah, I'll try the LED forum. Thanks.
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    Beam quality and tint of EagleTac MX25L4 SBT-70 bugs me

    I'm not sure how to do that without compromizing the thermal resistance between the LED MCPCB and the mounting surface/heat-sink. I wouldn't ordinarily tinker with the mounting mechanics of an LED burning this much power without taking great care to also not muck up the thermal management. I'm...
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    Beam quality and tint of EagleTac MX25L4 SBT-70 bugs me

    Yeah, I'm tempted to try the MT-G2. I have a bare one at work I haven't lit up yet. Maybe I should take a look at it today. If it's nice maybe I'll buy a MX25L3 MT-G2. The 5000K might be preferrable than the SST-90 based MX25L4. Then I'm contemplating to get the MX25L4T SBT-70 for a...
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    Spectrometer for CIE color coordinates, CCT, CRI?

    Hi: I'm considering to get a spectrometer which can measure a VIS/near-UV light source spectrum, and compute CCT, CIE color coords., and perhaps CRI. A fiber style cosine corrected pickup calibrated to directly measure lux wouldn't be bad either, then it could be swept to get the light...
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    Beam quality and tint of EagleTac MX25L4 SBT-70 bugs me

    Hi: I bought one of these, and there are two things I don't like: 1. Beam at several m distance or more has some rings around the hot spot, but not symmetrical. Rather they take up about 90-120 degrees of arc. Also, at greater distances there is a distinct donut to the hot spot. Ie., the...
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    Soraa GaN on GaN -- high CRI like you've never seen before

    Can't you find all the detailed specs on their www site incl. mechanical dims? I only have a few MR16s.
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    Trying to find a blue-green wavelength LED

    Here's a crazy idea, if you can tolerate pulsed/PWM light: Take a Lumileds Rebel Cyan LED, and drive it at a low duty cycle (5-10%) with about 5-7 amps. I'm not sure of exactly how much wavelength shift this will cause (I could measure it at work, but my boss is hounding me about other stuff...
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    Different types of blue emitters used in White LEDs

    Do you happen to know if the Cree LS fixtures use a stock Cree emitter?
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    98 CRI from BLUE emitter

    It's remotely possible that they have snuck in a cyan chip, covered with phosphor so you don't notice. Some other tricks could yield the same result too. Unless you image each individual chip onto a spectrometer and analyze them all it would be nearly impossible to tell by eye. Does anyone...
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    Soraa GaN on GaN -- high CRI like you've never seen before

    Imagine the day when tint (hue, really) is no longer even a topic of consideration. Color temp. is a different story. There simply has to be a range of options for CCT. But white is white no matter the CCT. Not greenish-white, or purplish white. Just white! Oh, Soraa did some research...
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    Soraa GaN on GaN -- high CRI like you've never seen before

    It seems that their target market initially is professional display lighting. There seem to be some folks in this forum that are awfully skilled at making connections with LED manufacturers to procure the very best bins of LEDs. I often wonder how they do it since whenever I try I get told...
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    Soraa GaN on GaN -- high CRI like you've never seen before

    Oh, another cool thing about Soraa's MR16s is that they have the "Snap System" of beam spreaders & shapers, color shifters, and a anti-glare louvre thing that magnetically attach to the front of the lamp. http://www.soraa.com/products/snap-system I think this is only compatible with the narrow...
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    Soraa GaN on GaN -- high CRI like you've never seen before

    Hi: Recently I've bought 7 different models of flashlights with Nichia 219 and 219b LEDs in them because I'm sick and tired of Cree LEDs' green hue when dimmed. Or ugly yellow/orange "high-CRI" neutral white. If I wanted orange light, I'd buy a damn lightbulb! I'm a 4000-5000K pure Plankian...
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