Recent content by NewBie

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  1. NewBie

    Many Years, Everyone Take Care

    I actually joined CPF on September 29th, 2002, under the user name Jarhead, after lurking for about a year. Over the years, I have shared a great amount of information publically, and additional information publically. I quite often tried to include links and references for folks to read for...
  2. NewBie

    Seoul P4 initial Evaluation- Production LEDs

    I do not know what their intentions are. Apparently this higher efficiency phosphor doesn't hold up as long, and is more temperature sensitive. The datasheet also has a warning about how the part shifts a bunch towards the blue in the first 1000 hours. If you look at jtr1962's white lumen...
  3. NewBie

    Effects of EMP on LED Lights?

    Re: LED flashlights and E.M.P. vulnerability - thoughts? The old thread is here: http://www.candlepowerforums.com/vb/showthread.php?t=136969&highlight=EMP Keep in mind, if you are one of the highly paranoid types, you can use closed, or shielded inductor, which should help when compared to an...
  4. NewBie

    Is the healing effect of Far-Infrared Radiation real ?

    There are a number of proven benefit areas, even NASA is involved with funding studies of wound healing, with one of the leading areas under their SBIR programs. The Phase I effort achieved its objective of ascertaining and demonstrating the efficacy of light therapy using LEDs, alone and in...
  5. NewBie

    Raleigh wants to be "world's first" LED-lit city

    One of the issues with Metal Halide is that once you get them in a fixture, attach a ballast, and all that jazz, is you can easily end up in the 50 something lm/W range. An example of a high bay setup, is shown here, and compared with other sources...
  6. NewBie

    Raleigh could be first LED city!

    Interesting "Progress Energy, Raleigh’s primary electric utility provider, says the floor equipped with LED lights uses over 40 percent less energy than the standard lighting system. Plus, according to Progress Energy’s research, the quality of light in the garage is greatly improved. "...
  7. NewBie

    The Crowned Cyclops ~~3/2/07 NEW Shots~~

    Re: The Crowned Cyclops *updated NEW BEAMSHOTS* Very nice! Appreciate you sharing the photos with all of us, thank you!
  8. NewBie

    Seoul P4 initial Evaluation- Production LEDs

    I did some spectral scans of the Seoul P4 and CREE XR-E @ 700mA: Un-marked up: Both devices were new at the time of testing. You'll note the different phosphor response of the two LEDs. The Seoul has more yellow, significantly less "cyan-green", and slightly less red. The blue is...
  9. NewBie

    White LED lumen testing

    I thought you might be interested in this, a spectral scan of a Seoul P4 USXOI bin and a CREE P3 WC bin. I originally did it for another thread, but thought you might find it useful: There will be an un-marked up one which I'll put in my Seoul thread. I noticed the Seoul has a slightly...
  10. NewBie

    White LED lumen testing

    It is interesting comparing the differences between the three of them. Do you happen to know the tint bins of each one? How were these mounted in each case, and what were they heatsinked with for the testing? Were these all bare LEDs mounted on the channel aluminum, or were any of them on...
  11. NewBie

    Fighting with efficiency, Boost Regulator, Eureka!

    Here is another technique for doing a current regulated buck supply (which can also be done with boost supplies), by using a pre-bias: http://www.edn.com/contents/images/6409620.pdf TI has some app notes where they also discuss the technique.
  12. NewBie

    Seoul P4 initial Evaluation- Production LEDs

    I didn't notice Extech's new meters have a "precision" sensor and filter. Very nice BPH! Now all we need is a model that has this sensor in it, plus a PC hook-up.
  13. NewBie

    Seoul P4 initial Evaluation- Production LEDs

    The tint shift should be less with less current over time, but this is not something I've tested. One of the large factors for tint shift over time is the die temperature, and it's affect on the phosphor. As I recall, the LED slug is held below 30C, the exact number should be mentioned...
  14. NewBie

    Ripple in various light sources

    The ripple is the light output going up and down. In these examples, it is something you would not see by eye. LEDs also get less efficient, the more ripple they have. The PD Wiz 2x2 has the least ripple. Higher frequency ripple causes additional dissipation in an LED die.
  15. NewBie

    Seoul P4 initial Evaluation- Production LEDs

    With the parts I've managed to get my hands on, I'd tend to believe the Seoul P4 is a tad more efficient, once you look at Watts consumed, at least when it is new. One of the falacies is that I've seen, folks pick a bottom binned P2 CREE, and then snag a nice U bin Seoul, and claim smackdown...
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