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    LED traffic signals

    Just a note to homebrewers: 3m's opticom and other related systems use only 2 frequencies of flash, 10Hz for "low priority" and 14Hz for "high priority." -Dan
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    Preserving Night Vision - Colors?

    The reason that the militay uses blue-green for their dial-lights in aircraft and land based devices and vehicles is because night vision gear is relatively INSENSITIVE to those colors. Typically in a night, wartime situation everyone, friend and foe will be using night vision gear, so the...
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    5-Watt Luxeon Stars *Almost* Available - who's interested?

    Re: 5-Watt Luxeon Stars *Almost* Available - who\'s interested? Just to add myself to the list.. I'd like 2 of them. I can only pay with US money orders though... I hope it's still possible to get in on this? /Daniel
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    Need diffuse smd white led source!

    Hi guys, I'm looking for a few (about 10) diffuse SMD white leds, to form into an LED backlight for an old LCD tv i have which uses a small fluorescent tube. Anyone know where i can find em for a reasonable price?? -Daniel
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    What kind of light is this?

    Another fascinating thing to note is that as neon bulbs get older, the neon slowly escapes, and they begin to flicker. This in and of itself is not too interesting. But the fact that the blinking is influenced by the incident light upon the bulb imparting energy to the neon atoms causing...
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    We search for bigger/brighter;they, for smaller/dimmer

    BBC has recently reported that a group project between Toshiba Research Limited and the University at Cambridge has produced a micro LED so precise that each activation can be adjusted to produce exactly ONE PHOTON of light.This page at BBC news describes the innovation, which they intend on...
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    9 volt Led

    There is a simple reason why 9V transistor batteries are not used for flashlights. They have a heinously low capacity... on the order of 50mAh typically with a VERY VERY VERY low (think µamperes) current draw.
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    Special Forces ActionLights?

    Thats the mount/batteries for their night vision goggles. The mounts have a hinge which flips down and locks on to the actual image enhancer units which are kept in nice padded cases till needed, the battery pack/mounts however are worn all the time. Daniel
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    ProMetric is here!

    Aw drat!, sorry for your bulb loss Those are expensive bulbs! Hate when that happens... -Daniel
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    ProMetric is here!

    The calibration source for the pro-metric looks an AWFUL lot like a 575 or 700 watt ETC Source Four theatrical fixture that I am more than aquainted with from many job in various theatres. Just out of curiosity, could you post the light plot for that fixture? I use them all the time and it'd...
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    UV light in movie theaters

    Well, if anything, the photon would probably help you find an "un-stained" seat... However, you might not like what you see... -Dan
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    LS color mixing?

    Thats the direction I was thinking in. If colorkinetics had good success with 5mm led groups, then a 6" or 8" fresnel sized fixture might actually approximate the light output of an actual theatrical fixture. -Dan
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    LS color mixing?

    Has anyone tried color mixing with the luxeon stars? They do make a red green and blue one.... Does it come out reasonably white when diffused? Or does the array have to be set up like the nichia RGB arrays where its 1R, 1G, and 2B, to make up for the lower output of the blue led? -Dan
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    Need ideas.... (warning, about 1mb of photos)

    I did a simple conversion of a similar light... The pictures show my simple resistor voltage dropper. I still havent gotten around to making up a true voltage converter. However, even with this inefficient setup, I still get approximately 15 hours of light on low and about 8 on high... It dims...
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    Terrorist Attack

    Being in NYC and a tiny part of the aid effort, I can tell you that they have an amazing amount of large machinery in the city... many many cranes/front end loaders/etc have been freely sent over to the site by private contractors from all over long island city and other surrounding areas. I...
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    Terrorist Attack

    Today was a very...very...very overwhelming day. I can still hear the horrible police scanner and hamradio traffic, which followed the attacks... My friends/family are all ok, thank goodness, but we're all very shaken... A friend's sister was in a highschool literally 2 blocks away, she saw...
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    Homemade 10 Nichia LED PWM Flashlight

    Hope you dont plan on bringing that on an airplane...Looks like a pipe bomb... Seriously though, very nice control panel on the big one... -Dan
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    LS flashlight retrofit

    Note: For some reason UBB turned my pretty Omegas after the resistor values into question marks. -Dan
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    LS flashlight retrofit

    Heres a link to a page showing my own use for those happy little Luxeon Stars from gransee... I've done a flashlight retrofit using a Specialized 6V halogen bike light. Its amazingly bright... also has 2 setings, High has a 4, 15? resistors in parallel, low adds 4, 68? resistors to the circuit...
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    Luxeon Star DIY flashlights

    I think you guys are going about this the wrong way... I think that the optical unit should be behind a piece of acrylic or polycarbonate plastic... Perhaps in a small sealed "head" unit made of plastic and sealed with RTV silicone. After all, maglites and the like dont have their optics out in...

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