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  1. lumengeek

    Nitecore D10 LED replacement

    Thanks for the speedy replies everyone, much apprecieted Great that it seems so easy to take the D10 head apart, it looks like this has just given me an excuse to buy the D10 :p I will keep the Fenix 'as is'. I actually like the cooler white of the standard Q5 for working on equipment during...
  2. lumengeek

    Nitecore D10 LED replacement

    Hi all, I am considering purchasing a Nitecore D10 (Q5 version) as I quite like the styling of this light. However, I will probably want to replace the emitter with a warm version. I have no problem with soldering on a new emitter, but I was wondering about the head itself - is it physically...
  3. lumengeek

    Hig pressure inside Fenix L2D?!

    Needle through tail switch is a good idea - thanks, I'll do that! :grin2: I have a charger that charges individual cells and can do a capacity test (Technoline BL700) so when I get around to it I'll cycle the cells a couple of times then see what their capacity is being reported as. I do know...
  4. lumengeek

    Hig pressure inside Fenix L2D?!

    That must have been it then, thanks for the reply I guess it's not a safety issue by itself, but it could be a bit nasty if the hydrogen/oxygen inside the light was ignited by trying to switch the light off :)
  5. lumengeek

    Hig pressure inside Fenix L2D?!

    Hi all, I was just doing a discharge duration test on my Fenix L2D (on high) with 2x2000mAh Uniross NiMh cells inside. The light was tailstanding, and everything was normal for the first ~1 hour, the body was slightly warm as you'd expect. Then I went downstairs for 10 mins, came back...
  6. lumengeek

    The importance of tailstanding

    haha that's what I've been doing at work recently in the evenings, except I stand the light on the window shelf instead. I could just switch the lights on but that would be boring :laughing:
  7. lumengeek

    Recommend me a light!

    Thanks for the replies everyone, yeah I can see now that my 30-60 incandescent lumens on 2.4v was probably a bit over the top. Regarding warm white LEDs, I have considered changing the LED in my Fenix L1D to a warm white version, that would be almost perfect but I have not been able to source a...
  8. lumengeek

    Recommend me a light!

    I've not had much luck in finding good quality, small incandescent lights except the 2AA mag. I guess what I'm ideally looking for is an incandescent version of the Fenix L2D, but obviously without the modes and the >100 lumens output... if such a thing exists! So to summarise - an output...
  9. lumengeek

    Flashlight Nightmare!!!

    I had a flashlight related nightmare a few weeks ago, I was going to post it in the original thread but never got around to it, so it can go here! It was late night, and I was upstairs in my room with a malfunctioning piece of equipment (I think it was either a frequency counter, or a modified...
  10. lumengeek

    5mm White LED Fade Test done!

    Interesting to see how you have recorded both phosphor degradation (with tint shift) and epoxy degradation in these tests. Very interesting to see some real results here, goes to show the importance of not overdriving these small devices! Thanks for sharing.
  11. lumengeek

    Cree XR-E Warm White in the UK?

    Just had a look, again they only appear to sell the chips by themselves, rather than the complete stars, at least in warm white
  12. lumengeek

    Cree XR-E Warm White in the UK?

    Hi all, I'm having extreme difficulty in finding anywhere where I can buy XR-E warm white LEDs mounted on stars/heatsinks and available to the UK. The only place I have found is Farnell, but they only seem to sell the chips only! I've ordered bits from DealExtreme before, but they don't seem to...
  13. lumengeek

    Malkoff M60W: Not a typo, it's the WARM version!!

    There are a few mentions in this thread that warm white is preffered for outdoors use, I'm just wondering what are the reasons for this? I'm very interested as I'm building some mountain bike LED lights right now, and the lower efficiency of warm whites wouldn't bother me really because my...
  14. lumengeek

    LED failure modes

    yes that has just about summed it up, thanks. I was starting to think the die was the most robust part of the LED. I guess due to the rated lifetime of thse things, no-one has really observed any 'true' failures other than epoxy darkening on 5mm leds, and premature die/phosphor failure on power...
  15. lumengeek

    LED failure modes

    thanks for the replies so far, it's interesting to find that the primary reason for failure seems to be the epoxy degrading, and not the chip itself! Could it be that the yellowing encapsulation also compensates for a degrading phosphor? (in other words, the light output from the chip becomes...
  16. lumengeek

    LED failure modes

    Hi all, I was speaking to a work colleague the other day about white LEDs and their rated life of so many thousand hours, but the question is what is the failure mode of the LED beyond it's rated lifetime? (assuming it is cooled properly and not overdriven). I can only assume that the phosphor...
  17. lumengeek

    Stages of Flasholicism

    well, for me the sequence has been: Build some halogen mountainbike lights > Become interested in white LEDs > Research into Power LEDs and Cree's > Discover CPF in a google search > Lurk around > Consider buying some Cree emitters for a project > Give in and buy a Fenix L1D > Buy a Fenix L2D...

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