Recent content by sven_m

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  1. sven_m

    Lux V Candela

    Quick Summary: Lux or Candela shouldn't make any difference. Except the vendor does it wrong :- ) Lux vs Candela? Ha! It's not about two but at least about three: Lux - the illumination at the target, the spot. Always keep in mind questioning: taken at 1m? (OK, that's the usual case), or...
  2. sven_m

    Hi CRI or neutral white ?

    defloyd77 might have a point, OP meaning purely hypothetically, for fun, "If you could only have 1 flashlight". If so, then I'm out. Yet, my thoughts about the very background might do no harm anyway. They even might make the decision a bit harder :cool:
  3. sven_m

    Hi CRI or neutral white ?

    An interesting serve :- ) Well, I don't think so. For me these are (almost) independent. And: you can have both. My guess: The source of confusion is the fact, that CRI (color rendering index) is not an intiuitive or an absolute value. It depends on the color temperature, how much it is worth...
  4. sven_m

    185Mcd 240W UHP Build

    It's just mercury for the emission, and some halogen for recycling vaporized tungsten back to the electrodes. The idea for developing this HID type: plasma temperature is limited by the ionization energy. Higher plasma temperature allows for higher luminance. Now, mercury has a higher...
  5. sven_m

    New "High End" HID Flame Throwers..?

    Just stumbled over this older posting. I guess the FF5GT has the typical automotive bulb (except envelope glass being removed as usual for the FFs): the electrode gap is about 4.2 mm, i.e. the well known 35W type (or 50W, but unfortunately the fat boy is history). I disassembled my light out of...
  6. sven_m

    Maxa Beam Battery Question

    (digging up old threads is fun) Cyrix9445, my advice: just replace the NiCd cells with a 4S-LiFePo pack. They are even available in sealed motorcylce-like battery format for $50-100 and fit into the battery housing. Voltage matches perfectly, 10 Ah means a nice runtime. I ran several MB light...
  7. sven_m

    Power on board HID flashlight

    I am a bit sceptical about LEP (plasma). I am an arc nut, and so I wanted to *know* 2014/2015 and aquired used equipment by lots of ebay searching: Luxim STA-41-01 Optimized for lumens and growing. See link to my review in TLF for pics. The big ballast housing is for passive cooling. 280 W...
  8. sven_m

    Using a Telescope for a Searchlight

    Old thread reanimation is fun: pro: Telescopes are perfectly fine for max spot lux, that is "throw numbers" on the paper: They have a good opening diameter (4 to 12 inches). Now, as only this diameter and the luminance of the source account for max lux, you could reach more than 10 Mcd with 10...
  9. sven_m

    Maxabeam questions/advice

    I've been running both a Gen 2 and an early Gen 3 for quite some time with a 4S-LiFePo brick directly attached, without any problems. I even managed to find one that fitted into my old NiCd MBP-1207 box. Here Matt mentions that the light should not get more than 14 V. You might ask ParkerVH if...
  10. sven_m

    CLOSED 2018 Yuji 3200K high cri 5mm LED group buy

    Re: 2018 Yuji 5mm LED group buy OPEN Great offer, thanks. I'm in for 25 (intl. shipping)
  11. sven_m

    HID Focal Point...

    I once read (might take quite some time to find that again, though) that - given the same bulb - it's rather the arc dimension and not so much the luminance which grows with increasing power. It might have been a paper about real Xenon burners, and only apply to that type. But this sounds like...
  12. sven_m

    Can reflector size affect LED tint?

    Suppose the tint is highly depending on angle of emission out of the emitter (longer way through the phospohor at light leaving sideways, shorter way for light leaving upright). Then the angle at which the outer area of the reflector is collecting light (contributing most to throw, is it steep...
  13. sven_m

    Some Carbon Arc Videos

    I was attending that 150cm (60") show. And I was able to get a glance at electrodes with arc through a welding glass: I had a luxmeter with me but unfortunately there was no way to illuminate an accessible point in 100+ m distance to measure illumination. [60in NASA zArc M7] I agree. The...
  14. sven_m

    Curiosity got the best of me; will Ceramic Metal Halide do in modified Cyclops Thor?

    :D Interesting question. So, why exactly do you want the huge reflector? I ask so because you don't need a wide reflector for lumens output. Diameter is only necessary if you want high spot lux, or if you want a spot as tiny as possible (due to the higher focal lengths, but then you also...
  15. sven_m

    Lemax LX70 Searchlight

    Re: http://www.worldpartners.co.th/LM70Super.html just stumbled over this thread. Oh dear: I really love calculations. Sorry, I can't resist: - luminous intensity ANSI distance is just as fine as luminous intensity. 3450/4250 m would be 3.0/4.5 Mcd, while the normal LX70 has 0.93/1.3 Mcd...
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