How long could this run?

[pedalinbob]

i just built a single Nichia 6400mcd LED light, using 3d alkies.

there is a switch, and a variable resistor, so i can sdjust from full blast (i did use a permanent 15 ohm resistor to prevent LED damage at full power) to just a tiny glow--just enough to find in the dark.

at full blast, i estimate it is drawing around 40 ma, or perhaps just a little less, but i havent measured it. it appears to be about infinity ultra bright.

i can also dim it nicely to about 6 lux, which is very nice for reading with the light close.

any math whizzes have any theoretical estimates for runtimes based on perhaps 3 modes: glow, low (plenty to read with), and high? maybe 2ma, 5 to 8 ma and 40 ma?

i have a runtime formula, but i am unsere if it is correct. if so, this thing will run for a VERY long time in glow mode--literally years. these calculations show that even in "low" mode, it might run nearly half a year.

i think i will call it "Enduro-lux". but "Fugly-lux might be more appropriate...

thanks,
Bob

 

[ChrisA]

i did a search on google that came up with a capacity of 18,000 mAh for an energizer d-cell. 3 of those will last nearly 300 days if you run the led at ~8 ma /ubbthreads/images/graemlins/ooo.gif

chris

 

[Charles Bradshaw]

Figure the runtime for low and high, then average them. Subtract 10 percent for safety. You should have a decent idea.

 

[webley445]

[ QUOTE ]
pedalinbob said:
i just built a single Nichia 6400mcd LED light, using 3d alkies.



[/ QUOTE ]

And you dared not to post a pic of it? Lets see thy creation man.

 

[pedalinbob]

ok. i have some pics of my little collection, including my 3 mods.

i have loaded the pics on my computer...now how do i post them here?

Bob

 

[pedalinbob]

ok. i havent figured out how to post pics directly to this site. it cant be too difficult...but i am technically challenged this morning, and too busy to really try.

if anyone can show me the "posting pics for dummies" i will be grateful.

here is a link to some pics i placed at imagestation. they show much of my collection (there are about 10 more not shown), including a twin luxeon mag (Franken-beam) which puts out over 500 lux, and a garrity 2aa modded with a luxeon.

then, there is the Enduro-lux: a single nichia LED with a dimming dial on top, powered by 3D cells. think of it as a giant and VERY long running PAL. it is sturdier than it looks.

there are also some beamshots from of the Opalec and Franken-beam. it clearly illustrates the awesome power of an overdriven luxeon. Franken-beam had 5 hours of straight runtime prior to this beamshot.

enjoy!

http://www.imagestation.com/album/?id=4290531215

Bob

 

[Xrunner]

Hello, nice mods! I especially like the franken-beam. Here is the pic of the "enduro-lux": (I hope you don't mind me posting it)

To post them here after uploading them to imagestation you open the album, right click on an image, select properties, copy the address, and then paste it into the post between [image]and[/image] (the address would go where the and is).
Hope this helps.

-Mike

 

[pedalinbob]

wow, thanks!

i will try a coupld of test posts tonight!

i was thinking of naming the beast that you posted "Fugly-lux"...for obvious reasons.

Bob