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  1. S

    General LED Question

    Also possible the inbuilt power supply overshoots before settling into regulation
  2. S

    Is a USB handwarmer safe (regarding fast battery discharging)?

    This is one of those things that is perfectly safe if the manufacturer is trust worthy. Some back of the napkin math with some given values. Manufacturer states 5200 mAh capacity. Manufacturer states medium mode may be used up in as little as 4 hours. Now some math. 5200mAh/4h cancel units and...
  3. S

    Interest Thread; Malkoff M61 New 519A 4500k / 5700k 9080 *Group Buy 2022!*

    It is a magenta skewed emitter. Notice the negative Duv.
  4. S

    sony vtc5a decent?

    They will be just fine
  5. S

    Trouble with E Series/Aleph Triple Build - Help Please

    Triples and singles work exactly the same in this case. You need to narrow it down to what part is not working. Can you hook up a new led board and test the driver? Can you test the triple led board, you can use a spare cr123a or Liion and power the LEDs without a driver.
  6. S

    LED/Emitter Visual Differencea

    Here
  7. S

    Help me pick a FL for a gift to an art expert

    Knowing this, do you think it would be prudent to maybe purchase two white lights to cover halogen and sunlight use cases?
  8. S

    Help me pick a FL for a gift to an art expert

    The second sentence explained that I was asking a question that would better provide a response at the request. But if prefered of the light will be used to assess art that will be primarily displayed under incandescent or warm light then an SST-20 2700k and if the light will be used to assess...
  9. S

    Help me pick a FL for a gift to an art expert

    Before you settle on that light consider how the light will be used. The goal is to evaluate the art work to be displayed where? Would a person hang this artwork up to be displayed during the day? IE lit by daylight? Will it be moved to a museum or art gallery, lit by lighting that is either...
  10. S

    Aleph1 vs P60 beam comparison?

    This question is far to broad to really a response. There is no standard P60 reflector and the definition of better varies by person.
  11. S

    Using UnProtected Cells in a High Drain Flashlight

    Can you be a bit more specific with what lights and what happened? In general the danger is to the cell itself not the light (over discharge) If you are worried that using a high drain cell in a light that allows unlimited turbo levels, that is a function of using a high drain cell not a...
  12. S

    what makes a flashlight a effencent. ?

    What do you mean by efficient? Do you mean lumens per watt which would be a combination of an efficient driver matched with a emitter with a high lumen per watt? Or do you mean efficient at its job such as effectively lighting up a spot area or floody to get close in job done?
  13. S

    D65 "Video White" and High CRI Flashlights - Mind Blown!

    High CRI barely sells outside of the enthusiast side of the light segment. Within that small segment most people prefer 4000k, you do the math on why we do not see a ton of non ~4000k High CRI lights. There are some finally lights out that that deviate from that, mostly on the warmer side. Lucky...
  14. S

    Best 18650 out now??

    Reading their product page it suggests using a cell with a protection circuit so by that I would guess that it does not have its own built in voltage monitoring.
  15. S

    Orbtronic vs other brands of NCR18650GA

    The thing to remember is that none of these are an actual NCR18650GA they are all 18650 cells that happen to use an NCR18650GA. The NCR18650GA is made my Sanyo and only comes as a bare cell with no added parts being PCB or button tops or anything else. These are all 3rd party contraptions that...
  16. S

    So hard to find a good high cri light nowadays

    Jon, this one is tripping you up a bit. Performance of an LED especially the older style LEDs like 219b vary wildly with mules. Based upon what I am seeing with that test assuming it is a head on measurement that the E21A, or at least in that array is far more consistent across its varying...
  17. S

    Zebralight headlamp H600w, H600c, or H600d

    Between the Fc and Fd buy based upon your preferred CCT. Between those two and the Fw the Fw will be thowier despite all being 'F' due to the nature of the XHP35 vs XHP50. As for 80 vs 90 cri the answer is if you are color critical then yes, if you are comparing them side by side then yes, if...
  18. S

    Zebralight headlamp H600w, H600c, or H600d

    My opinion on the F Zebralights, get the frosted lens because you want it to be floody.
  19. S

    So hard to find a good high cri light nowadays

    If you add a lee eighth plus green to your sw45k you will improve its R9
  20. S

    So hard to find a good high cri light nowadays

    Here you go, Here is the E21A and the 219B against each other, trying my best to hold them far enough apart. I grabbed the E21A first so I just used it, I can try and compare with Optisolis if you are curious. What you see is a comparison mostly between CCT, the lower ~4500k has more red...

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