Tried a new mod - viola! - the M6D-P90 is born

NotRegulated · Feb 10, 2005

Last night I installed a Surefire P90 bulb into my old M@g 6D. It works quite well and was easy. However, I don't know the longer term implications of this mod. I assumed that 6D's = 9 volts and the P90 is 9 volts. Is this a viable stable mod that has been tried before? How much run time would I expect out of this setup?

wquiles · Feb 10, 2005

You should read this other CPF post:
http://www.candlepowerforums.com/ubbthreads/showflat.php?Cat=&Number=864785&page=0&view=collapsed&sb=5&o=365&fpart=1

Basically it says that the rating on the P91 is not really 9 volts, it was designed probably more for between 7-8volts under load, so you are potentially running the risk of flashing that bulb - your milleage might vary /ubbthreads/images/graemlins/grin.gif

Will

NotRegulated · Feb 10, 2005

This is the P90 bulb not the P91.

bwaites · Feb 10, 2005

It will handle the 6 D cells with no problem, there is significant resistance in these cells as well as 123's and they are not actually delivering a full, true 9 volts either.

Bill

NotRegulated · Feb 10, 2005

Thanks for the reply. it's a "good news" reply!
I was hoping that this mod would work without the risk of flashing the bulb. It really makes the 6D a useful bright tool.
I do not have a formal electronics background so I am at a loss with some issues. Is there a way that you know of to calculate/determine how long the runtime would be with the six D cells? I would assume that they should have way more capacity than three CR123 cells, but you know what they say about "assuming" things!

bwaites · Feb 10, 2005

Go to the manufacturers site and download the file on this particular cell.

It should give you a MaH rating.

My guess is that you can run the P90 for 3-5 hours on D cells.

Bill

idleprocess · Feb 10, 2005

Runtime will depend on how much current the P90 nominally draws and how the cells perform under that load.

bwaites · Feb 10, 2005

Right, but we know the numbers for the P90, just not which cells he is using.

Bill

StainlessSteel · Feb 10, 2005

Just bought a 6d m*g, P90? W/A? other mod?

NotRegulated · Feb 10, 2005

[ QUOTE ]
bwaites said:
Right, but we know the numbers for the P90, just not which cells he is using.
Bill

[/ QUOTE ]

I am using 6 Alkaline Duracell D cells.

mdocod · Jun 15, 2006

the P90 draws ~1.2 amps... anything over 1 amp will really kill some of the potencial of alkaline capacity... (this is probably why maglight is using bulbs that draw under an amp in all their alky lights)...

I would estimate over 5 hours of good output though... with many hours thereafter of deminishing light..

Tried a new mod - viola! - the M6D-P90 is born

NotRegulated

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