Run-Time Plot - Mr Bulk DD3DIII

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Roy

Roy

Farewell our Curmudgeon Administrator
Joined
Apr 14, 2002
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Location
Granbury, Tx USA
This battery runtime plot is for a 3xD Maglite that was modified by Br Bulk with a new reflector and a LUX III 3w LS. Three Wal Mart Everactive Alkaline batteries were used.

Equipment used is a Extech Mdl 401021 Light Adapter into a Radio Shack 22-805 multimeter whit a PC interface that is using ScopeView software (V1.08).

The vertical axis is in vDC and is equivalent to 500 Fc @ 1 Fc per division. The horizontal axis is one hour per division.

Be aware that youractual battery milage may vary from that indicated by this runtime plot.

The runtime to 50% max brightness = 7 hours 50 minutes
dd3d.jpg
 
Look here for more details about this light!

I have no idea just how long that light would go....I quit after 40 hours.
 
Seems from your graph, it was at full brightness for about 3 hours?
Not too bad for no regulation.
 
The runtime to 50% brightness was allmost 8 hours! Each vertical line is one hour...each dark line is four hours.
 
Roy, thank you so much for doing this. I didn't stop to think how doing this tied up your computer and how many 9V batteries you had to use.

From now on, I will include money not only to cover return postage, but to defray the costs of plotting and something extra to show my appreciation for this very valuable service you provide all of us here on CPF.

That extremely long line of 500fc at 1 foot is a total surprise to me!

This is an amazing light Charlie made to demonstrate the capabilities of the Luxeon III. Your plot of it's performance has proved to me it's worth as a household, shop, vehicle and emergency light. Not to mention it makes a fine knob-scobber as well. /ubbthreads/images/graemlins/grinser2.gif

Thanks again, Roy, for the excellent work. A contribution is inbound. /ubbthreads/images/graemlins/thumbsup.gif

Britt
 
I think LightScene is speaking from 4,5 Volts that 3 D cells should deliver.

actually the voltage drops under the load from the LED and goes down to 3,5 volts.
 
Thanks Roy.
If I understand this correctly, the 3.494 represents the voltage generated by the light meter when the batteries were fresh, which corresponds to 3,494 Fc @ 1 Ft.
 
Correct! My light meter is actually a lightmeter adapter that plugs into a DMM and is calibrated such that one mvDC is equivalent to one Fc. I set the measuring distance at one foot so that 1Fc @ 1Ft = 1LUX @ 1M.

Actually the first logging point is where I turn on the logging program.
 
Bringin back an old post from the dead. Roy, if you can remember, about how bright was the light at the 40 hour mark?
 
Eric, it was 500 footcandles at 1 foot. It had become rather monotonous so Roy pulled the plug at 40 hours. I don't know how much longer it would have run at that steady 500 fc.

The 500 fc @ 1 ft is about equivalent to 500 Lux @ 1 meter.

Britt
 
What would be expected runtime for NiMh Cells ? it would be more (i presume)... but by what factor ?

Also, after looking at this light, it seems that it is not a *regulated* Output ?

Thanks & Regards,
ViReN
 
Do not use any form of rechargeable batteries in a Lux III direct drive mod!!! You will likely fry the LS!!! /ubbthreads/images/graemlins/icon15.gif The only way using rechargeable batts. is safe is to at very least add some resistance in series with the LS.

The Mr Bulk DD3DIII is a direct-drive light (no regulation), thus the DD in the name:
Direct-Drive, 3D batteries, Lux III.
 
Oh Led mod Man.....

Thanks for the Information....

I didnt knew what meant for DD3DIII....

NiMH 3D battries will do about 15AH of power.... it sure will fry the things up /ubbthreads/images/graemlins/wink.gif

-ViReN
 
The cavaet, not running rechargeables with DD setups, is really important when using luxeons having low (H or J) vf. Elektrolumens DD, FT-3C, running 3C's, does ok with rechargeables when vf is K or higher.

Bill
 
Rechargeables have a lower ESR (effective series resistance) and therefore can provide higher current, but they also have a lower terminal voltage than disposables.
When the LED's Vf is high (bin K or higher for a white Luxeon, for example), you won't run the risk of letting all the magic smoke out of the LED.

Bullzeyebill is absolutely correct here.
 
Even 3 teeny, little 500mah nimh N cells from www.battlepack.com pack a punch in my Ledlenser "1 watt" V2 powerchips.
4.0 volts x 1.5 amps gushing through, = about 6 watts! /ubbthreads/images/graemlins/eek.gif
They both still work fine. /ubbthreads/images/graemlins/grin.gif
Maybe I should put in resistors?... nahhh.
Too late, I'm already addicted to the high overdriven light output. /ubbthreads/images/graemlins/grinser2.gif
 
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