Albinoni
Banned
Can a torch (LED) say with 85 Lumens project a more brighter and powerful bean than one with say 150 Lumens.
Brightness Question
- Thread starter Albinoni
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carrot
Flashaholic
Sure, it's possible.
Lumens is a measure of total output. When we say "project a brighter and more powerful beam" we usually quantify that in lux, which is a measurement taken at a single point, not the entire output.
A laser pointer, for instance, has a very low lumen output, but you can still see the dot when you shine a very high output spotlight in the same place. Reason being, the laser concentrates its output into a tighter beam than the spotlight.
Take the Surefire E2L for instance. It is rated at 40 lumens but can run alongside the 60-80 lumen pack and still fares pretty well. It also offers much more runtime than the higher-lumen candidates. This is because it concentrates more light into the hotspot and less into the spill or flood.
Lumens is a measure of total output. When we say "project a brighter and more powerful beam" we usually quantify that in lux, which is a measurement taken at a single point, not the entire output.
A laser pointer, for instance, has a very low lumen output, but you can still see the dot when you shine a very high output spotlight in the same place. Reason being, the laser concentrates its output into a tighter beam than the spotlight.
Take the Surefire E2L for instance. It is rated at 40 lumens but can run alongside the 60-80 lumen pack and still fares pretty well. It also offers much more runtime than the higher-lumen candidates. This is because it concentrates more light into the hotspot and less into the spill or flood.
Albinoni
Banned
Ok very interesting, so lumens is nothing to do with the measurement of brightness.
Gunner12
Flashaholic
Lumen is the measurement of overall brightness, while Lux/Candlepower is the measurement of hotspot brightness.
LukeA
Flashlight Enthusiast
That's a little confusing. The lumen is the unit for the number of photons exiting a light, and lux is the unit for the number of photons hitting a certain area.
thermal guy
Flashaholic
Sure fire put it in a easy formula pour a bag of sugar on the table the whole pile represents the total output the very tip is candlepower.
Sir Lightalot
Enlightened
Really? i could have swore it was the other way around...:thinking:
hopkins
Enlightened
since both Lux and Lumens start with 'L' people (like me!) forget
the definition.
I like our CPF terms of flood and throw and 'the center spot' but
how to put numbers to them...hmmm. Where's a 5th grader when you need one?
Anyone know a rymne for this like the color code on resistors?
-or want to make one up?
:nana:
the definition.
I like our CPF terms of flood and throw and 'the center spot' but
how to put numbers to them...hmmm. Where's a 5th grader when you need one?
Anyone know a rymne for this like the color code on resistors?
-or want to make one up?
:nana:
