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    Finally received the MDXL Cree and Ultrafire C3

    The Ultrafire C3 is a really nice cheap light. An eyeball comparison shows the C3 to be just about on par with my Elektrolumens XM-3 which employs a Luxeon III and uses 2 AA cells. The C3 has a slightly tighter spot, but otherwise the light output results in a pretty much dead heat. I have...
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    REXLIGHT 2.0 AMPERAGE DRAW?

    I bought several. The first I have tested with 2000mah eneloop and 2500mah energizer NiMH cells. I am afraid the thing may be dangerous. I left the light standing on its tailcap on high for an informal runtime test. After about 10-15 minutes the LED cut out. About 15 minutes after that I...
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    Looking for cheap small UV light..

    The lighthound link redirects to the main page. Please explain which of the (currently) 7 different UV lights they stock you mean to indicate. The CPF thread begins with questions about a 12 LED light from lighthound, but it is not clear what you are pointing to...
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    Summer camp 1xAA LED

    Hmm, the powerlight looks like it fits the bill for much less money. This is good! Has anyone here done a runtime test on the critter? I would like to thank everyone for their input. While the solar and/or rechargeable scenario has a certain appeal, neither will be practical in this...
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    Summer camp 1xAA LED

    I am looking to buy a set of cheapish LED flashlights for my friends' children to use at summer camp. I am wondering if the Ultrafire C3 (Cree) would be an appropriate choice, as it is touted to run on everything from NIMH to LIion? My expectation is that the kids will be sent off with a...
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    Positive LED slug epoxy trick

    Gryloc: I'm not sure that all milk cartons are coated with LDPE. The thicker, slightly waxy feeling deli container lids are what I use. I suppose that the plastic lid from a steel coffee can should do the trick. Just look for the LDPE (4) recycling triangle molded into the plastic...
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    Positive LED slug epoxy trick

    I'm not clear on why people keep talking about using Arctic _Silver_ epoxy in a situation where electrical isolation is necessary. Arctic Silver, both heatsink compound and epoxy are electrically conductive. The Arctic Alumina products are *not* electrically conductive and should be used where...
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    Positive LED slug epoxy trick

    It seems that a number of people doing upgrades and mods have been bitten by the fact that the SSC (Seoul Semi-Conductor) emitters have a positive slug much like the red and R/O (Red Orange) luxeon emitters and stars. I have seen advice in the forums to cure a thin layer of Arctic Alumina...
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    Nuwai Q-III observable flicker?

    I cut open the second package (much better color), and double checked my initial impression. I invite you to swirl the hotspot in a tight circle and observe what I might term slurring. This effect is far less pronounced on a directly driven light. Overall I think the Q-III rocks. I bought...
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    Nuwai Q-III observable flicker?

    I am in receipt of two Nuwai Q-III lights and I am not sure that I can believe my eyes. I think I am seeing a high speed flicker from the boost converter. This is not necessarily bad. If I wave the beam across a wall I can make out dark bands indicating that that the LED is being pulsed. It...
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    MXDL 3Watt "Luxeon" 3AAA from eBay

    Re: MXDL 3Watt \"Luxeon\" 3AAA from eBay The emitters in the two 3 Watt MXDL flashlights I received are both low dome "batwing" style. I am wondering if the reflector design will provide a smoother beam with less pronounced rings if the emitter is swapped out for a lambertian high dome...
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    Luxeon clone

    For comparison I offer a photo of one of the mounted emitters In the two MXDL 3 Watt flashlights I recently purchased on Ebay. The PCB reads Kerui in script. In the photo linked above the emitter is wired such that the script is obscured. If desired I will attempt other angles and attempts...
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    Ebay MXDL 1Watt..fixes

    3Watt emitter photo was Re: Ebay MXDL 1Watt..fixes It seems not to be a Luxeon at all. It looks like a white low dome "UFO" with two holes drilled in a circular aluminum disk. The emitter leads are soldered to a conductive gold plated bowtie shaped overmask that is overlaid with white with...
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    Ebay MXDL 1Watt..fixes

    I just received two of the 3 watt model, black, with the fluted head. The flashlights I got do not contain Luxeon emitters. The unit is direct drive and the low dome emitter is mounted to a white PCB marked Kerui in script. I cleaned up the emitter (soldering flux goo) and added a little...

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