Recent content by Dave_H

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    How much difference is there between smart phone "Flashlights"?

    Clip-on selfie light <tee-hee!> Got one OTC with 36 LEDs and USB rechargeable for $2! Dave
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    Longest runtime for budget single AA or AAA led light on low setting to be used in tornado shelter

    I'm sure Cree and SST are not the only ones who make LEDs with high efficacies, and at least some "cheap" LEDs from vendors we may not have heard of can do a decent job these days. In another thread I pointed to Samsung LED giving up to 220 lumens/W at 0.2W . I guess we're a bit OT but wonder...
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    Longest runtime for budget single AA or AAA led light on low setting to be used in tornado shelter

    My $1.50 Dollar Tree 12-LED lantern on low setting, running on 3xAAA currently around 0.9v/cell, draws 15mA and is still producing useful light. Positioned correctly it could light a small room, albeit dimly but enough to get around in. With current technology say 100 lumens/watt, I am guessing...
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    Which led has the most lumens per watt?

    It depends. XHP70.3 high-power (12.6W) LED has some pretty good efficacy up to around 170 lumens per watt, but it's for specific tint and low CRI (70%) and spec'ed at +25C. Samsung came out with a small (0.2W) white LED with 220 lumens per watt, and that was several years ago...
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    Longest runtime for budget single AA or AAA led light on low setting to be used in tornado shelter

    A note to OP, I frequently run down "free" used alkaline/zinc-carbon AA and AAA in small 3-4 cell lights for which current control is no more than a series resistor. Many will run for many hours (or days) on these weaker cells, at lower brightness. I use them as night-lights. Just another idea...
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    Longest runtime for budget single AA or AAA led light on low setting to be used in tornado shelter

    A bit off main topic as OP is looking for single-cell AA or AAA, as noted 18500 fits in some (but not all, depends on holder) low-cost 3AAA flashlights; some even take 18650. However if goal is short-term cell wide availability without need to recharge, primary AA/AAA may be the best choice...
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    High pitched whine coming from new flashlight

    Whining sound coming from a light indicates either something not good in the design, or something not working properly. How loud is it? Perhaps somebody knows if this is "normal" for this light; which model is it? As for return that would be your call. Dave
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    Longest runtime for budget single AA or AAA led light on low setting to be used in tornado shelter

    I am seeing lots of brand-name, some pricey answers to simple requirement. For low-cost solution, I found 1xAA mini flashlight/worklight at Dollar Tree, but have not seen them in-store for the better part of a year (this is in Canada); and I don't see it on their U.S. website. Cost was $1.25...
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    Looking for a low output (1 lumen or lower option) LED mini lantern.

    If you want to talk cheap, even ultra-cheap, I am using a $1.50 12-LED 3AA lantern from Dollar Tree, which has rotary switch low/high setting. I've had it apart (and managed to get it back together!) and found a resistor for low setting. It's still fairly bright on low, but increasing resistance...
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    Favorite budget light 2022

    Is the battery chamber long enough for an 18650 (or failing that, 18500)? I always check my cheap 3AAA lights for this. Sometimes the holder has contacts at one end so that doesn't work. Dave
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    if i replace them weekly are alkines safe?

    I have a habit of running down all my free alkalines in cheap devices, but even in short term keeping an eye on things, they sometimes leak. I am usually but not always able to clean things up, but often corroded cell contacts are unreliable. Leak getting into electronics is another matter. I...
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    Headlamp for close work (AA? COB?)

    I agree, COB with flood is probably best for most close-in work to avoid bright spots and edge effects on what is being worked on, perhaps some exceptions when you need tight illumination. I am glad somebody in another thread mentioned long-press brightness control, as the low-cost combo I have...
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    Bike light w/night twinkle/flash, USB charging?

    Not sure about other jurisdictions but where I live, bicycles driven on public roads are treated as vehicles; some of which applies to lighting. Obviously this is not identical to powered vehicles, but some requirements apply. I think it's not as likely to be enforced strictly, but funky light...
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    Cheap 18650 zooms for scopes — state of the art?

    Even the single-LED zoomies (cheap ones I have) project LED die image including bond wires, when narrowly focused. Dave
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    Headlamp for close work (AA? COB?)

    COB LEDs show up in dollar-store products (such as Dollar Tree) so they are a low-cost solution. Not inferior, just has pro's/con's. Filaments are a sort of COB but different construction. Dave
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