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  1. J

    high power LEDs in 45° ambient temperature

    Hi, not sure if this is the right place, if not, please move or point me to the right place. my wife's family lives in Africa where day temperatures rise up to 45°C and night temperatures can stay above 35°C. in the near future, I'll be visiting them and 1 thing I would like to offer them is...
  2. J

    looking for PWM controlled constant current component

    Hi, difficult to put a clear title, but this is what I'm looking for: A driver chip for high power LEDs that is constant current, and where the output current can be controlled using a PWM signal while the output is not a PWM output. So, I'd like to use a PWM signal to control the output...
  3. J

    how to driver 4 XPG2 off 12V NiMh battery pack

    Hi, I'm looking for a better solution to my current setup: I have a 12V NiMh battery pack. I'd like to keep it that way to stay compatible with other packs from friends since those battery packs are not mine. The pack goes from roughly 14.5V to 9V over its discharge period. I want to drive 4...
  4. J

    modding DX sku 128269 for more current

    Hi guys, I know SKU 57779 and 128269 from DX are quite similar, but since the 57779 is sold out, I'd like to focus on the 128269 driver. It is supposed to give about 2.5 to 3A. I read that the 57779 gives about 2.7A, but I couldn't find any info on the other driver. I'd like to mod it to...
  5. J

    Gilan Navigator mod with Gaggione LLC49R

    Hi guys, I found a Gilan Navigator through a local website for second hand stuff. The light had a problem. It wouldn't turn on properly. It would just light up for a fraction of a second and then go out again. After taking it apart, I noticed that the microcontroller is always under power, and...
  6. J

    circuit for optical feedback loop to stabilize led output?

    Hi guys, I'm working on a project were I want to use a high power led with a constant intensity. I know there are constant current drivers enough, but I'm looking to change the current (not PWM!) in case the output drops due to aging, temperature changes, etc (typically rather slow intensity...
  7. J

    greenforce head for photography

    Hi everyone, I'm looking into using a small halogen greenforce light head for a underwater photograghy light. Since the person I'm building the light for has no idea how much light he needs, I was hoping you could help me out here a bit. For now it will be a single head, mostly used in low...
  8. J

    looking for ideas for a mag2D upgrade

    Hi guys, I was asked to upgrade a mag 2D to led. On the LED/optics side, I don't see any issues so far, I'll probably use a 44mm DX aspheric with a cree xml so that I can keep the ability to focus the light at will. I'm more curious to your solutions for the driver in a mag 2D. I've been...
  9. J

    greenforce diamond mod?

    Hi, I have a greenforce diamond (a bit similar to an ultrafire W200). it uses 2 CR123A batteries to drive a 700mA driver. This driver powers a luxeon lumiled LED. The optic is a tir optic, but when I got the light (2nd hand), it was loose in the housing so the beam wasn't very impressive. After...
  10. J

    lost in alloys

    ok, So I finally got myself a lathe and finished my first mod to a dive light, this is going to be fun :) but I want to go and buy some bare aluminium for making heatsinks. I found a local shop that sells in small quantities as well, but then I noticed they have all kind of aluminium alloys...
  11. J

    DIY laser power meter?

    Hi, I searched the forum but couldn't really find an answer so let me ask the question. Does anyone know a rather basic circuit diagram for a laser power meter using a photodiode that allows to change the offset (caused by the operational amplifier(s))? I'm aware of the power meters from...
  12. J

    greenforce halogen to LED conversion

    Hi guys, got my hands on an Arrow 12 from greenforce for very little money and thought it would be a good host to mod. The light head is a halogen head but I can't find any picture of this head (4 thin o-rings around the front of the head) on the internet so I'm assuming this must be one of...
  13. J

    Maglite stepped lens design

    Hi guys, I'm looking for a thread but can't find it using the search. (or did it get lost?) Someone posted a google sketchup file of a stepped lens for a maglite. Anyone knows which search terms to use to find it? or if someone downloaded the file, can you post it? thanks, Johan
  14. J

    how do you protect li-ion batteries for a pack?

    Hi, I'm in the process of preparing to build a cannister for a divelight. I'm wondering what kind of lithium ion batteries you guys use and how you protect these batteries from over(dis)charging. I was planning to put 2 or 3 LiIons batteries in series and then connect several strings of these...
  15. J

    fixed focus -> distance?

    Hi guys, Since this post got lost due to a backup restore, I'll post it again. I'm working on a Mag mod using an aspheric, and while doing some calculations, I noticed that I was missing some piece of information that I never encountered on this forum, and also never really thought about. If...
  16. J

    My UltraFire W200 SSC P7 mod (with howto and lots of pics)

    Hi people, I've been following this forum for a while and have been ordering some parts here and there, but never got around to finish the mod I had in mind. I joined this forum to learn about the Ultrafire W200 mods since I wanted to mod this light myself. Since I noticed that some people...
  17. J

    IR leds

    Hi, Does anyone know a source where I can get high power IR LEDs? I already found epitex but I'm still looking for other sollutions as they are pretty expensive. The wavelength of the LED should be somewhere between 1400 and 1600nm. If you know of some other (non-high power) leds in this...
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