Recent content by IMSabbel

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  1. I

    REVIEW: Nitecore TINI Keychain Flashlight

    Hm. Thanks for the review. THe total nonexisting water resistance is a bummer.
  2. I

    10 xml led heatsink question....

    Thats absolutely more than fine.
  3. I

    Is it dangerous to discharge a ni MH battery too much?

    Absolutely not In fact, NASA policy for sending NiMh batteries into space (to ISS, for example) is (or at least was a few years ago) to completely discharge them and clamp both contacts together before loading them into the rocket.
  4. I

    How can I estimate the thermal resistance of the thermal grease layer?

    You can not even just estimate it, you can calculate it exactly: 20mm star has about 3cm^2. So 6W/m*k multiplied by 3cm^2, divided by 0.4mm is the result you want. BUT: 0.4mm grease thickness is beyond horrible. Ideally, you would only have a couple um left, with parts of the heatsink having...
  5. I

    1/10th of a lumen

    Jetbeam RRT01. Infinitely variable ring with kinda-logarithmic scaling. If you turn it just a bit, you get something down to a few microlumens. (i.e. the die can be turned so dim that a tritium vial is blinding in comparison).
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    New Cree XHP in a 3535 package!

    Ah thanks. Missed that pic when looking through the spec sheet. Makes sense. Measured out the pics and got 1.2mm die size, with nearly zero gap between them. This gives about 45% bigger die surface than an XM-l. Thinking about it, it might really be a single die, but just seperated in serial...
  7. I

    New Cree XHP in a 3535 package!

    IF its a monolithic die, I really wonder how they get that kind of Vf. Vertical stacking of pn-junctions?
  8. I

    High Output, High Heat Environment LED

    You are WAY to pessimistic. The thing will be much cooler. Its on the intake side of the radiator. If the air pulled in by the fan was 200F at the position of the heatsink, your engine would be dead already.
  9. I

    Are Incandescent Flashlights Dead?

    Well, they are going to make them as long as people buy them - the factories and production lines exist and are paid for, and they sell them at such a markup that it would be insane to stop. And seeing that the managed to put the image of a 2D maglight as "THE" flashlight into the heads of...
  10. I

    *NEW* Sunwayman G25C Dual Button Light

    Looks like the bigger button has a raised edge around it.
  11. I

    Are Incandescent Flashlights Dead?

    Its the 21th century, with over 7 billion people around. NOTHING is ever going to be completely dead. Just like people enjoy music on vinyl, drive around on unicyles or cure their own leather, some people are going to like incan lights, and as long as there are enough around (which is easy...
  12. I

    XHP70 crude test

    Pretty cool. How are you going to power that array?
  13. I

    Luxeon-A Question

    Its a zener diode to protect the LED itself from voltage spikes.
  14. I

    40W Laser Tube No Idea How To Wire Up

    Again, do NOT mess around with CO2 lasers. 40W is enough to permanently blind even from a reflection. And CO2 lasers are pretty deep in the infrared (about 10 um wavelength), which means that stuff that does not LOOK reflective or transparent to your eyes can be just fine for it.
  15. I

    Thrunite TN36 (3xMK-R, 4x18650) review: RUNTIMES, BEAMSHOTS, VIDEO and more!

    My guess would be that the light is current regulated instead of PWM, and that in firefly mode, the current is low enough that differences in forward voltage between the leds mean one of them is mostly bypassed completely.
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