Recent content by TEEJ

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    Easy to Understand Lumens Vs Lux Explanation

    The "target" is a lux meter. The meter is calibrated to the size of its sensor, so, the lux (Lumens per square meter) is calculated from whatever hits the sensor of known size. The actual UNITS are expressed in terms of lumens per square meter (Lux). The throw unit (cd) is expressed in terms...
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    Easy to Understand Lumens Vs Lux Explanation

    The "target" is a lux meter. The meter is calibrated to the size of its sensor, so, the lux (Lumens per square meter) is calculated from whatever hits the sensor of known size. The actual UNITS are expressed in terms of lumens per square meter (Lux). The throw unit (cd) is expressed in terms...
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    Projecting a line with an LED light

    A small aspheric lens might do it for you.
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    GET-TOGETHER - FCW-14 / FSM-2 - NJ, NY, CT, PA area - 9-8-18 to 9-11-18

    Dammit. I just saw this. I'll try to make it out next time. :(
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    Easy to Understand Lumens Vs Lux Explanation

    Exactly. Lux can be MEASURED at any distance at all...as long as its far enough away for the beam to have fully formed....if the lux at that distance is to be used to calculate the lux at OTHER distances. The cd of the flashlight is back calculated to represent the lux at 1 meter though. :D
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    Absolute Brightest

    The concepts to consider here involve how far away you want to see what, and, how fast you might be going. For example, the "brighter a light is" can mean bright , in lux or cd, which tells you how far away will be lit up (Any one still telling you candle power is almost guaranteed to be using...
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    Easy to Understand Lumens Vs Lux Explanation

    I understand what you are saying, but, lux is what bounces back to your eyes....the lumens per square meter. If the surface is angled, less is reflected back to your eyes, so the flashlight sent out the same amount and quality of light, but, essentially, less was reflected back to you. If...
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    Is it feasible to 'pot' electronics on a non-potted flashlight?

    Vinh does potting and also other toughening, such as thicker wires with better solder, better switches and thermal paths, etc. He has given me quotes to deliver dozens of ruggedized lights for police departments, etc. :D
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    Serious tests of cell phone flashlights?

    I have light measurement equipment, its the availability of phones to test that is limiting. :D
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    Easy to Understand Lumens Vs Lux Explanation

    To clarify - This is incorrect regarding the beam spread on a target. Remember that the light being emitted at the target has no idea of the target, etc. So, if the target is a mouse, the beam is not more concentrated at its hot spot than if the target is an elephant, or a circus tent, etc...
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    PF22! Flashaholic Get Together: NJ, NY, PA, CT Area +

    Several family members and friends went through bypasses, and, yeah, its scary at first, but all recovered fine..and, in fact, felt better than they had before the operations. Looking forward to your full recovery!
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    PF22! Flashaholic Get Together: NJ, NY, PA, CT Area +

    When someone has sanded off their fingerprints, its pretty damning though...sort of like when everyone's hands are black with the soot, and one guy's are clean because he washed them. :D
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    Looking for a good thrower

    I also forgot to mention that people used to disposable batteries, because they are conditioned to go out and find/buy more batteries, over and over again...forget that the beauty of rechargables is that you don't need to be always running out and getting new ones. IE: I have 18650 cells that I...
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    Is there really a difference between a weapon light and a regular light

    Yeah, its about features and construction. The recoil and banging around a weapon light might have to be able to deal with, plus the typical need to mount a remote to it...change what a light might look like. A large issue is the cell chamber, as with some, the slamming of the recoil can get...
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    Why carry two EDC knives?

    I might have 3 on me at any one time, but not always the same 3, as they tend to be task specific...as if I'm on duty or just at home, etc. I have a small folder on the keychain...and that gets to open packages/make small cuts mostly. I have several 3-4" folders that I use for assorted other...
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