abvidledUK
Flashlight Enthusiast
The question we've all been waiting for the answer to !
What is the RT of the cheapy keychain light.
Quoted 16,000 mcd led. It is bright.
So, it's 5 hours very bright, running to at least 6 hours usable.
(I only expected an hour or so)
But then, my 9v clone is still bright at 5ma.
https://www.candlepowerforums.com/threads/133569
I wanted the LED for my 9v clone, so didn't mind running down the 2016's, I have loads anyway.
EV= my lightmeter EV reading, distance of 6", to give initial baseline reading of 8, using all the electronics you see. But then, the higher initial 10.3 reading shown is the light on it's own, no external electronics, same distance.
This was my initial set-up
Detail of magnetic clips onto 2016, older ones, the newer ones didn't seem to be of a metal that the magnets would stick to.
Closup of multimeters
However, after an initial promising start, I found that the thin croc clip leads were affecting the current draw.
I changed the leads for fatter ones, slight impovement, but current still low.
So, I bit the bullet, withdrew all electronics, and just pointed another new keychain light direct at the meter, and checked back every half hour.
The graph is above
What is the RT of the cheapy keychain light.
Quoted 16,000 mcd led. It is bright.
So, it's 5 hours very bright, running to at least 6 hours usable.
(I only expected an hour or so)
But then, my 9v clone is still bright at 5ma.
https://www.candlepowerforums.com/threads/133569
I wanted the LED for my 9v clone, so didn't mind running down the 2016's, I have loads anyway.
EV= my lightmeter EV reading, distance of 6", to give initial baseline reading of 8, using all the electronics you see. But then, the higher initial 10.3 reading shown is the light on it's own, no external electronics, same distance.
This was my initial set-up
Detail of magnetic clips onto 2016, older ones, the newer ones didn't seem to be of a metal that the magnets would stick to.
Closup of multimeters
However, after an initial promising start, I found that the thin croc clip leads were affecting the current draw.
I changed the leads for fatter ones, slight impovement, but current still low.
So, I bit the bullet, withdrew all electronics, and just pointed another new keychain light direct at the meter, and checked back every half hour.
The graph is above
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