Recent content by 2xTrinity

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  1. 2xTrinity

    Lux to Lumens

    I can confirm this, I am fortunate to have access to one of these handheld integrating spheres at work: http://www.labspherestore.com/product-p/aa-00775-00x.htm I can verify who is lying about their lumen claims by pointing one of my flashlights inside the opening and pushing a single button...
  2. 2xTrinity

    High CRI High colour temperature

    That's about right. The actaul surface temperature of the sun is 5778K, A decent fraction of the blue energy is scattered by the atmosphere resulting in average daylight as seen on earth having a slightly lower apparent color temperature. I have no idea why 6500K became a thing for artifical...
  3. 2xTrinity

    For self-defense: Graph to detail relation between lux, and severity of visual hazard

    Green lasers that are much more powerful than 100mW, that use expanded beams, are used as non-lethal weapons in military and police applications: https://en.wikipedia.org/wiki/Dazzler_(weapon) The way these work is basically it photobleaches a large fractino of the eye all at once. That much...
  4. 2xTrinity

    Cree XP-L High Intensity LED

    Sorry in advance for the mild thread necromancy: I take their ststement to mean higher output for entire optical systems or luminaires that use the XP-G2 chip. Since the XP-L HI chip has higher surface brightness it may end up with more total throughput through the secondary optics. That...
  5. 2xTrinity

    Remote Phosphor Tech - Are these efficacy values possiblel?

    Not at all. Best example I can think of of this technology is integrating spheres, which are used to accurately measure the number of lumens coming from a light source: http://en.wikipedia.org/wiki/Integrating_sphere Idea of an integrating sphere is to completely diffuse all the light that is...
  6. 2xTrinity

    WL Phosforce

    Agreed theirs is a poor design. In the event of phosphor failure, blue light will emit directly out of the device. That doesn't necessarily have to be the case though. I'm about to attempt a project like this in the near future, but using the general idea of a luminescent solar concentrator...
  7. 2xTrinity

    FL's higher & higher Lumens, throw further & further, how far can you actually SEE?

    Re: FL's higher & higher Lumens, throw further & further, how far can you actually It's actually proprtional to the cube. It takes 8x the power to go double the speed (assuming air resistance dominates, which it does at 100mph+) Drag force is proportional to the square of the velocity. Power...
  8. 2xTrinity

    What are your thoughts on the direction of future flashlight tech going forward?

    Battery tech of the future (speaking ~decades out) is probably Aluminum Ion. About triple the energy density per weight compared to LiIon is possible. 1 molecule of AL can supply 3 electrons instead of just 1 for each molecule of lithium. Aluminum is also ultra-plentiful so that would take care...
  9. 2xTrinity

    What are your thoughts on the direction of future flashlight tech going forward?

    Phosphor-doped sphere at the end of a fiber tip, then pump blue laser light through the fiber and use that as a retrofit omnidirectional source to use big reflectors meant for arc lamps. You might need to build it around something like a heat-pipe as support to help with heat dissipation in the...
  10. 2xTrinity

    MIT develops 200% efficient LED

    I read the paper. The device was only operating above-unity electrical efficiency when the substrate was heated to well above ambient. It was at 200% at 135C. When operated at room temperature, the substrate was cooling down but it was a net consumer of electrical power like you'd expect from a...
  11. 2xTrinity

    Why no 10W Cree RB led?

    Probably this. They want to keep the best blue LEDs for white LED applications, or their own remote phosphor products. For white LEDs to be emitting over 200 lumens per watt, the radiometric efficiency of those blue dies has to be 75%+ whereas the efficiency of royal blue dies for sale based...
  12. 2xTrinity

    Daylight visible LED vest?

    Around where I live I see a lot of motorcycles run modulators on their headlights in the daytime so that the intensity of the DRL is pulsating. This makes them a lot more noticeable from a distance. Out here in the desert the mirage/silhouette effect you described is fairly common so flickering...
  13. 2xTrinity

    MIT develops 200% efficient LED

    This is basically a heat pump, and calling the device 200% efficient is misleading. The usual term for heat transported / electrical power for heat pumps (heaters or refrigerators) is "coefficient of performance", not "efficiency".
  14. 2xTrinity

    Cree announces 276 lumens per watt!!! (okay just in a lab setting)

    Makes sense that we'd see higher efficacy (lm/watt) at a lower color temperature. 4400k white has a lot more power density in the green where the eyes are much more sensitive.
  15. 2xTrinity

    the future of extreme throw?

    Note in my test the laser, LED, optics and mirrors were mounted on an optical table. Specular laser reflections were absorbed using beam dumps. The laser was run at eye-safe power levels during the alignment process. Finally I used a power meter to compare the relative brightness of the LED...
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