Recent content by drmaxx

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    Budget hotspot free light to appease crazy dog?

    Ever tried a laser? Or is the dog indeed a flashlight fanatic?
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    Where do you think we'll top out with this lumen thing?

    Let's assume that we can get max. 75W (20 A draw) from one 18650 battery and 100% luminous efficacy then we can get a theoretical 75W *680 L/W = 51000 lumen per battery. Now lets slap some efficiency coefficients on that: Let's go for 10A draw = 50%, 80% for the electrical/electronic system and...
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    Lux to Lumens

    It already was established that this is wrong. There is no given distance. It is just the light intensity at a given spot. The easy answer is: Go outside on a clear night with half a moon. There is probably about 0.25 lux around you. The long answer is: If you have 0.25 lux at a specific spot...
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    Heat Management

    Didn't we just had this discussion a few weeks ago? Edit: I just realise that more_vampires actually found the link to the thread I was thinking about. Move along - nothing to see here:wave:
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    Lux to Lumens

    Sometimes physics makes life complicated. However, google is really your friend here. It doesn't get simpler - see for explanation why in the threads above.
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    Weird Issue with Jetbeam DDA20 vs DDC10

    I have no clue about the lights you are talking about. Looking at the batteries you use - that's what I exactly would expect. AA can not handle the same load compared to RCR123. You can drive a light harder with the RCR123 and therefore it would be brighter. Somebody with knowledge about the...
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    Does it ever bother you that a leaky battery can destroy your high end flash light?

    Yep!:welcome:
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    Newb confused about series cells.

    Not quite: A or mA is the size of the river; mAh is the size of the pond on top of the waterfall.
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    Newb confused about series cells.

    Or if you want to have a metaphor: The mAh is the number of tennis balls (electrons) and the V is the height this balls fall from.
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    Newb confused about series cells.

    As I tried to outline above, 6 cells always have 6 times more capacity. This doesn't always translate into more or longer light. Yes, I just chosen your example in the first post. Different cells have different capacity. E.g. eneloop 'classic' have 2000 mAh and the new eneloop pro have 2550 mAh...
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    LED flashlights and enloops, so confused about mAh and performance

    They have about a quarter (2550/2000 = 27.5%) more performance. You need to decide if this matters to you. The main issue is, that the high capacity NiMH have a shorter life span. So, if you recharge them a lot then you will loose this advantage after a while. Additionally, they are more prone...
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    Newb confused about series cells.

    The capacity is defined as the amount of energy the batteries can supply. The unit is Joule or Wh (Watt-hour). Watt-hour is calculated by multiplying the average voltage with the Ah (Ampere-hour). Therefore 6 batteries always have the same amount of capacity (energy). It is either 6 x (1.2V x 1...
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    High-end Flashlight Makers Could Re-bin LEDs for Better Tint

    I think the central question here is: Who needs a well defined tint and/or high CRI and is willing to pay for it? This defines the market size. And my empirical guess is: Not many. Most people that care about an expensive flashlight have many other much more important criteria, such as battery...
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    US Coast Guard drug bust (submarine)

    lovecpf
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    Any stories of using STROBE as a Self-Defense Weapon?

    Thanks Robocop for some perspective. I always cringe seeing the words [some type of light] "as self-defense weapon". Light / strobe might give you an edge/advantage in a conflict - but it certainly is not able to defend you by itself.
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