Magcharger bulb on 2 18650, how many lumens?

[AlexGT]

I have been using 2 18650 li-ion cells to power a magcharger bulb in a 2C mag configuration, it is very bright and white! and so far I haven't instaflashed a bulb yet, I am wondering how much lumens I am getting out of it.

Anyone knows? I am thinking about 250L but not sure.

AlexGT

 

[andrewwynn]

using the [http://hotrater.rouse.com]hotrater[/url] you can put in some estimated values.. i used 8W, 1.34A and 6V for the baseline.. i put in 180 miliohms resistnace (assuming you didn't put in any resistance fixes).. I put in 200L because i read once that mag states the lamp produces 200L and that is in-line with what i'd expect the efficiency to be.

with 180mohm and 7.2V nominal.. you can expect 6.94V at the lamp and 8W will bump to 10W.. lumen output will go up to 333 bulb lumen and 216 torch.

if the lamp can take it.. and i predict it can estimating a 75 hr lamp life rated.. you can fix the resistances and get 7.14 to the lamp and get 239L out the front..

OR: you can run the 1111 lamp for 530L :-D

with more accurate values for the baseline (hours/watt/volts/amps).. it would be easier to get more accurate.

nice, simple mod.. kudos!

-awr

 

[Northern Lights]

AWR-I was using your hotrater to get these done and out and voila! You used your own calculating spread sheet and beat me to it.
Mag posts on its site the bulb is 218 lumens and 50 hours lifetime. They claim also two hours run time; that would be about right at 1.3A bulb.
So basically I get the same magnitude of predicted light. I will PM AlexGT

 

[AlexGT]

Thanks for the replies guys!

I have some WA 1111 on order from Litho, My setup is a FM 2.25 Mag C, 2" deep reflector, with a FM Ceramic bipin base, I have done all the resistance mods and "some improvements" and deoxit and progold all the connections to get even lower resistance.

The resistance mods I did were: Tailspring mod, polished the brass contact ring inside the switch, soldered a piece of solderwick from the switch to the cap of the tower spring, and a direct solderwick connection from the "-" switch contact to the PR ceramic base, what would the estimated resistance be?

I am amazed the Magcharger bulb didn't instaflash on 2 18650's right off the charger, it is crazy bright!, I did compare it to a standard Magcharger and my setup looks brighter! :rock:

I am thinking in using the magcharger bulb for LOLA and the WA1111 for HOLA along with 2 AW Li-ion C cells.

Thanks for the link to the hotrater, I was looking for it.

AlexGT

 

[andrewwynn]

re-working with the fixes described.. you should have about 40 total miliohms resistance.. (down from about 200!) that will net you about 7.14V to the lamp and about 264L out the front.. your 250 was ammmazingly close! The lamp does re-rate to the 'danger zone' of 6.2hrs lamp life.. don't use hot off the charger.. in-fact as somebody has suggested.. wouldn't hurt to run a bit of current out of them before using.. an appropriate 5W resistor would work wonders... you will be very low risk instaflashing the 1111 because of the higher drain rate.. the vLamp will be much lower since the batteries' internal resistance will come into play.

-awr

 

[gammaray1965]

Andrewwynn, Could you PM me please, I tried to get in touch with you at your e-mail, but are having some technical difficulties!

Thanks, Gammaray

 

[AlexGT]

Thanks!

AlexGT

 

[andrewwynn]

gammaray.. check your email.

-awr

 

[AlexGT]

I measured the voltage at the pins of the bulb when turned on and I get a reading of 7.50V Using the hotrater program it turns out to this:

WOW! 475 Bulb lumens!!!! I Did the conversion to torch lumens by multiplying it by 0.65 and I get 309 Lumens!!!! Not bad at all! The only problem is the life of the bulb, Do you think it will go out with a flash or a bang? Maybe I will just replace it after about 1-2 hours runtime.

AlexGT

 

[andrewwynn]

lol.. did you actually use a calculator? the torch lumen conversion is in the big orange bar! with bulb life rated to 3.5hr means you can expect about a dozen uses out of the lamp so yea that's a big problem. you want numbers at least 6 hours and 10 is better.. when direct-driving if the hour life is less than 8 you are in the extreme danger of instaflash category. Measure the lamp after a few minutes of operation to see what the voltage settles down to.

-awr

 

[AlexGT]

LOL I actually did! Before paying attention to what all the columns were about. he he he.