Recent content by mdrejhon

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  1. M

    Help! (scientific experiment) Cheapest/easiest way of 150 watts per square foot

    Thanks for the useful answers here. You've given me some scientific variables I need to be concerned about. Some extra comments: - Good point about time-constant of white phosphor of LED's. I had covered that already. On that suspicion, I tested a photodiode with an oscilloscope on single...
  2. M

    Help! (scientific experiment) Cheapest/easiest way of 150 watts per square foot

    Help! Find a way to cut the cost of this as much as possible. Cheapest way to do a 1 to 2 square feet array of LED's. I am doing some scientific experiments that require me build a very bright, thin, even backlight strobe illumination device. I will be needing the following: - Even lighting...
  3. M

    Remote-control color-changable LED light rope/tape/ribbons (5 meters)

    Thanks for the very useful information. To be fair, cheap CFL's have caught fire too, but I am curious about incidents specifically relating to these LED strips as well. Chase is not important, but future whole-strip DMX control might be desirable addition in the future (set the color of...
  4. M

    Do High-CRI LED Incandescent-Bulb Replacement Units Exist

    I like the Philips AmbientLED A19 bulbs (60 watt replacement, about 850 lumens, 12.5 watt), which although only has a CRI of 80, it seems to be better than that -- since usually I can tell the difference between LED and incandescent, but this was the first LED bulb that tricked me into thinking...
  5. M

    Remote-control color-changable LED light rope/tape/ribbons (5 meters)

    More advanced questions include: - Can I mix vendors, as long as they're all using SMT5050 LED's on the same light ribbon? They seem to all have standardized 12 volt hookups, four conductors (3 colors plus 1 ground). - If I decided to later splurge on a more advanced controller than a $10 cheap...
  6. M

    Remote-control color-changable LED light rope/tape/ribbons (5 meters)

    Hello, Does anyone here have experience with remote-controlled LED light rope/tape/ribbons? I have recently discovered that the prices for 5 meter (16 foot) LED light ribbons have fallen to between $25 to $35 on eBay, Amazon and many other resellers -- you know those light ropes that can...
  7. M

    LEDs more or less electronically "noisy" than incan/CFL

    While there's point of diminishing returns the higher frequencies you go, there's still potential for nasty stroboscopic effects, such as with a kitchen fan, or a fast-spinning bike wheel, and similiar. I still recommend the tens or hundreds of kilohertz, it can be done with minimum RFI. As...
  8. M

    LEDs more or less electronically "noisy" than incan/CFL

    Very interesting -- yes, I would be inclined to agree that constant current is all we need for dimming. The linear brightness capability is more useful for, say, computer displays. Many backlights, including for cellphones, use PWM for dimming, but this wouldn't necessarily be the best way as...
  9. M

    LEDs more or less electronically "noisy" than incan/CFL

    Constant current is fine, as long as the smoothing capacitors don't interfere with the final brightness of LED. There's pretty narrow range of voltages and the LED often changes color at different voltages. Basically, a very dim green LED sometimes becomes yellowish or orangeish. But you...
  10. M

    LEDs more or less electronically "noisy" than incan/CFL

    I think high-quality flicker-free dimmable LED bulbs, compatible with today's wall dimmers, need to come out soon. I think this is doable - LED's can be to be driven by a very efficient switch-mode power supply that has the ability to be powered off triac'd AC and various types of dimmed AC...
  11. M

    First LED street lamps now erected in Amsterdam NL

    Believed to be the world's first LED streetlamps in actual operation. Very interesting article, found on CNN and some other news sites: http://www.cnn.com/2005/TECH/07/18/spark.light.reut/index.html Others: http://www.pcmag.com/article2/0,1895,1837551,00.asp...
  12. M

    LED Ropelight

    One of the things that I've thought of is finding a source of 3/4" or 1" clear plexiglas tube, and stuffing the newer bright blue ForeverBright Xmas lights inside them -- creating a more inexpensive, albiet rigid, rope lighting. The tube would force the 1" bulbs to be spaced only 2" apart or...
  13. M

    65-watt-equivalent LED lightbulbs! (22 watts)

    Chris M / Led Museum, Were you able to get your bulbs ordered?
  14. M

    how can i safely limit the output of a cfl?

    Dimming a CFL is done for handheld computer backlights (modern PalmPilots and PocketPC's) So it is possible to dim certain kinds of CFL. But what kind of CFL, and what method of dimming to use?
  15. M

    LED Pimp Bed

    Another idea -- how about some clearance of the newer brighter ForeverBrights, space the bulbs only 1 inch apart, and slip them inside clear plexiglas 0.8" or 1" PVC tubing. Then you'd have very seamless, inexpensive continuous strip/accent lighting, fully dimmable! Have multiple tubes for...
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