It’s one of those with the flanges on each side to contact the battery tube, the main diameter of the board is about 15mm with the flanges going out to about 17mm.
Yeah these little pocket rockets are great with IMR cells, drawing about 2.5A on high which may get you 5mins of use before it gets too hot then just lower the mode and it’s fine.
FWIW, my phone’s flash LED clocks in at 13.4 lumens.
Almost any 1xAAA light will be able to smoke almost any phone, and then with bigger batteries it just goes up from there.
Most modern 1xAAA keychain lights put out as much light as a massive old 4xD-cell incandescent Maglite… though the beam won’t be as focused so it doesn’t go as far. Better for up-close use.
A traditional reflector-based light which puts out 500 lumens will generally look brighter than a car headlight. Cars typically put out more like 1000 to 1500 lumens, but the beam is more spread out so it’s not as intense as a 500-lumen flashlight.
Just for some reference points.
is that why high beams look brighter? or are they actually more lumens ?
Depends on the particular high-beam, but for the most part they’re merely aimed higher, so other drivers are in a brighter portion of the beam. Some headlights are actually brighter on that setting though.
But in general, the apparent brightness is usually more dependent on how focused the light is than on how many photons it’s putting out. Hence why a 1-lumen laser pointer looks brighter than the light from a 1000-lumen light bulb. It has a higher lux value, even if its lumens are far less.
… and the current world record holder for longest throw (most intense beam) in a LED flashlight only puts out like 800 lumens. It’s practically a laser. 10,000-lumen monster flood lights don’t look as bright, even if they put out a lot more actual light.
alright so better lux means it looks brighter at any range other than pretty much 30 feet in front of you because it dumps all the light on its target rather than it spreading out everywhere… correct?
and how much lux is that 800lumen record holder?
Higher lux (candelas) means the center of the hotspot is more intense. However, the hotspot might also be pretty narrow, meaning it’s only useful at a distance.
So, yes, you are correct.
The world record holder is the “DEFT-X”, which gets a bit over a million candelas worth of lux. For reference, direct sunlight at noon on a clear day near the equator is about 100,000 cd, so this is about ten times as bright as sunlight. But it has only a hotspot; there is no spill… and it’s a very narrow beam:
ah good pic! and makes sense, my current light is the BTU shocker, which i am deciding on weather to get dedomed or not, should have great spot plus decent spill with both upgrades !
As a general “napkin math” estimate, de-doming tends to almost double the lux, or increase the throw distance by about 40%. It also makes the hotspot shrink to about two thirds of its original diameter.
These are, of course, very very rough estimates.
(lux relates to throw according to an inverse-square curve, so 2X the lux means sqrt(2)X as much throw… and the de-domed hotspot will end up with about 1/2X as much surface area, ish)