What am I looking for? sorry for my ignorance

[Fird]

I'm looking for another potential use for my pair of Emoli 1850's, which were given to me by a GREAT CPF'er for use in my CL1HV3 (which I just bought an incan p60 module for just to give it a shot.) They're capable of 20amp discharge! I'd love to really use these cells to more of their capability so I've been considering an ROP running @7.4v and somewhere around 5 amps. Should give about 15-20 minutes of runtime on the 1450mah cells. It'd be nice to have the bulb slightly over-driven for maximum efficiency, but I also don't want to blow it up every other time i turn it on.

I'd like to do minimal modification to the body because I'm not a machinist. I'm assuming a 2C will be the closest host. Also need a reflector and lens.

I'm not an incan-follower so this is rather new territory for me.

Fird

 

[mudman cj]

2 18650 cells can fit in a 2C if you move the switch forward and cut down the tail spring. You could also purchase an extender or have the tail cap modded by Mirage Man. There are a couple of extender options. AW cells one that forms an O-ring seal at each end (also available from Lighthound), and there is another one called Mag of the Ring that is cheaper but does not seal with an O-ring at one end.

There is another issue you need to be aware of. Emoli cells are a tight fit at best in C mags, even with the wrapper removed and replaced with thin Kapton tape. See this thread for more info.

The ROP high draws 4.2-4.4 Amps depending upon battery state of charge, which should give you 20 mins of runtime as you said.

 

[Fird]

k, is there a better host option for these cells? It'd be really nice to not have to bore out the body..

 

[mudman cj]

You could use a Mag 2D with a piece of PVC pipe cut down one side (to allow flex) and then a piece of vinyl tubing to take that inner diameter down to near the cell diameter. This host will not be a bit too short like the 2C, so it won't need an extension. You will even still be able to store a spare bulb under the spring because unlike the 2C you won't have to cut the spring down. For your spare bulb, I suggest a longer running bulb than the ROP high, like the ROP low or even a 5 cell krypton or 6 cell xenon mag bulb.

 

[Fird]

aha, a very good idea on the spare bulb thing. I understand the ROP Hi's bulb life is not so hot..

I'll do a little hunting around, thanks!

Fird

 

[Fird]

You could use a Mag 2D with a piece of PVC pipe cut down one side (to allow flex) and then a piece of vinyl tubing to take that inner diameter down to near the cell diameter. This host will not be a bit too short like the 2C, so it won't need an extension. You will even still be able to store a spare bulb under the spring because unlike the 2C you won't have to cut the spring down. For your spare bulb, I suggest a longer running bulb than the ROP high, like the ROP low or even a 5 cell krypton or 6 cell xenon mag bulb.

Ok, so the bulb contacts/holder (is there a holder, i can't remember??) can take the heat, just the reflector and lens get replaced for the ROP-Hi mod?

Also I'm thinking about using the Phillips 5761 bi-pin, where do I get a ceramic adapter for such an animal and what does it set me back?

Otherwise if I use the ROP bulb, I'll probably put the ROP low in the tailcap as you suggested. The Emoli cells claim to be able to sustain 3.8v nominal under load so i should get somewhere near 1k lumens out the front i hope.

Hopefully I'll have money to burn some day and can get some D-cell Li-ions for some serious run time at 1k lumens :devil:

Fird

 

[mudman cj]

On long runs with the ROP high, sometimes the solder at the tip of the bulb can melt, and also the plastic bulb support can melt due to high resistance and high current through the spring inside. *Edit: I can't recall if the melting support was only a problem on C size Mags or also on D size Mags. I know I saw pics of a melted C type pedestal, but perhaps the different plastic used in D mags takes the heat better.* Look up resistance mods for the mag switch using copper wire or solder braid to reduce resistance. I also read of someone replacing the melted bulb solder with a higher melting temperature solder and he had no further problems with the solder melting. As for the bi-pin adapter, there are multiple versions out now. Some of the best are sold by Fivemega. Inexpensive ones are also available at KD. There are others out there as well. Check B/S/T if you want to save a little on a particular type.

 

[Fird]

thanks for the link to fivemega, that's the bit i couldnt' find.

Fird