I want something more than the *Mag85*

[bc5000]

I built my Mag85 about a year ago and have really enjoyed it. I use it just about every night. But now it's time for something much brighter.
I was looking at FiveMega's 3D using 12 AA's and the Osram 64611. He say's the runtime is around 20 minutes, which I wouldn't want to go any less. I want a thrower so I would prob go with a FM 2.5" Throwmaster head.
I would have bought one of his already but I'm not real crazy about the fancy scroll work. I just want something "plain jane", or a "sleeper". If I built one myself, is there anyplace that would bore my Mag 3D?
I just wanted some opinions on this setup using the 64611 bulb. Or maybe some other suggestions.

 

[JimmyM]

The Philips 5761 and Osram 64275 are good choices for a step up (small)from the Mag85 that can still achieve decent run times in a "normal" size light. They're, normally, 6V bulbs so they overdrive nicely with a reasonable cell count. The 64275 has a very small filament so you get a decent throw just from a standard 2" aluminum reflector. Of course the 2.5" head will give superior throw but will deviate from your "plain jane" appearance.

 

[RoyJ]

The Philips 5761 and Osram 64275 are good choices for a step up (small)from the Mag85 that can still achieve decent run times in a "normal" size light. They're, normally, 6V bulbs so they overdrive nicely with a reasonable cell count. The 64275 has a very small filament so you get a decent throw just from a standard 2" aluminum reflector. Of course the 2.5" head will give superior throw but will deviate from your "plain jane" appearance.

If they're 6v bulbs then 12 cells would be a no no. I'm a little skeptical directly driving a 6V G4 bulbs even with 8 cells. Or do AAs sag THAT much under a 4 amp load?

 

[JimmyM]

If they're 6v bulbs then 12 cells would be a no no. I'm a little skeptical directly driving a 6V G4 bulbs even with 8 cells. Or do AAs sag THAT much under a 4 amp load?

Oh, no. they'd on 12 cells. If you definitely want the FM 12 cell light, then the 5761 or 64275 would not be appropriate. I was suggesting an alternative light package, not just an alternative bulb. The 5761 or 64275 would work with 6 AA cells in an unbored 2D. But the draw would be too much to run for 20+ minutes. You'd have to use D Li-Ion cells to get that kind of run time.

 

[bc5000]

Thanks for the replies. I just want the whitest, brightest light that I can get with at least 20 min runtime. I searched for the Osram 64611 bulb and not much comes up about it.



:wave: 50th post

 

[JimmyM]

The 64275 is definitely WHITE on 7.1V. Runtime can be achieved using 2 Li-Ion Ds. AWs C cells might not give the full 20 minutes. In a larger package, you could drive it with 6 NiMH Ds and get more than an hour of run time.
I'm sure thare are other combinations that will work to drive the 64275.

 

[mudman cj]

Does the answer have to use your AA cells? If so, what type of cells are they? (brand and capacity).

Are Li-ion cells an option? How about unprotected D size cells that require a lot of care and caution?

The other question that has come up is one of size/weight. JimmyM can tell you what it's like to use monstrous lights full of Nimh D cells. They give you the runtime you are after, but at a substantial cost in portability and usefulness IMO. It also sounds like you are after a light that is intended to be useful for more than just 5 minutes of starting fires to impress the uninitiated.

There are lights that can deliver just under 3000 lumens for over 20 minutes (though maybe not without intermittent cooling), but along with that comes added risks and worries. If you want the safest battery chemistries, then battery capacity is generally reduced, so for 20 minutes of runtime the light won't be able to use as much power.

 

[JimmyM]

Thanks for the replies. I just want the whitest, brightest light that I can get with at least 20 min runtime. I searched for the Osram 64611 bulb and not much comes up about it.



:wave: 50th post

That's a target than can be hit with a LOT of different combinations. Can you give us a size you'd like to stay within? Are you comfortable with Li-Ions? Do you definitely want to use your AAs?
I suppose this is like anything else.
"Bright, Small, Run Time. Pick any 2"

 

[bc5000]

Well I'm used to the 3D, so I have no problem in staying with that. I want to stick with AA's too.

 

[bc5000]

I wish FiveMega would make these again. This is just my style.


http://www.cpfmarketplace.com/mp/showthread.php?t=68347

 

[JimmyM]

That's the "Elephant" right? The answer to massive side-by-side cell count. You could almost fit sub-Cs 3 wide in that thing.

 

[cat]

Except that they're even harder to get than bored bodies.
I say that because I'm having a problem trying to convince myself that A123 or emoli in a long body is an alternative to a bored 3D.

 

[mudman cj]

With 12xAA cells, you can get as much as 1.2*12=14.4V with good cells, but high current cells will only have around 1800mAh. That gives 1.8Ah*14.4V=25.92Wh. For 20 minutes you can draw three times as much power as you could draw for 60 minutes (60/20=3), so that limits your power to 25.92*3=77.76W. Now, there is no bulb that will draw exactly 77.76W/14.4V=5.4Amps and be nice and white at 14.4V. So, you have to compromise on either brightness or runtime and possibly color as well.

If you don't mind a yellow light, you could run an IRC bulb. These bulbs really need 18V to shine, but you could run them with 14.4V. The 50W IRC (64440) would run at about 64.6W, 2160 bulb lumens, 1404 torch lumens for about 24 minutes, the 35W IRC (64432) would run at about 47.8W, 1555 bulb lumens, 1011 torch lumens for 32.5 minutes. These values come from the hotrater spreadsheet made by AWR.

For a whiter light, you could go with the 5761 or 64275 that JimmyM suggested. This would require wiring your pack 6s2p for 7.2V and 3600mAh.
This would run the 64275 at 46.4W, 1351 bulb lumens, 878 torch lumens for 33.5 mins.
This would run the 5761 at 39.6W, 1448 bulb lumens, 941 torch lumens for 39 minutes.

Even though the 50W IRC gives the most lumens, the yellow color of that choice combined with shorter runtime really makes the 5761 the best choice IMHO.

If you can go with a 4D light and use another 3 or 4 cells, then other bulbs like the IRC series will provide more lumens (and whiten up considerably).

 

[fivemega]

I built my Mag85 about a year ago and have really enjoyed it. I use it just about every night. But now it's time for something much brighter.

If you need a flashlight much brighter than M*g85, then don't think about anything less than 50 watt. Not worth to spend money for 20% more light. You won't even notice the difference unless compare next to each other.
I am sure somebody will be able to bore out your 3D M*g and make pack of 11 or 12 high current cells to power up correct bulb to satisfy you.
To avoid boring, you can use 4D with same numbers of cells in tri stack configuration instead of quad.

 

[JimmyM]

True, FM. The 5761 or 64275 won't be "MUCH" brighter.
The choices for a 60-80W bulb, 20 minutes of runtime, AND using AA cells is a tall order. The 50W IRC on 15 AA cells might be in the ball park for brightness and cell type, but runrime might come up short.

 

[bc5000]

The 50W IRC on 15 AA cells might be in the ball park for brightness and cell type, but runrime might come up short.

So what type of host would I need for 15 AA's, a bored out 4D? I think even a total runtime of 15 minutes is not out of line. Whenever I've used my Mag85, It's always been in bursts of maybe 30 sec to 1 min.

 

[JimmyM]

Most AAs fit 3 wide into an unbored Mag D body. You NEED to do tri-boring if you want to use 2/3A, 4/5A, A, or 4/3A cells. They can push MASSIVE current with greater capacity than AA cells in a equivalent length. A cells (2200-2300mAh) can push 60 amps.
The 50W IRC at 17V (1.2*15 minus 1 volt for resistance and sag) works out to almost exactly 5 amps. Elite1700s hold voltage quite well even at a 10A load. They should give you 15-20 minutes using the 50W IRC. 17V is a lot for the 50W IRC. IIRC, they don't overdrive as well as the 65W IRC. So you may want to try 13 or 14 cells first.

 

[bc5000]

You really got me interested in the 50W IRC now. I've been doing alot of reading on it. It looks like I would need a quad-bored 4D to fit 4 stacks of 4 AA's with a dummy or a tri-bore 3D using 15 2/3A?
I'm not sure how available the bulbs are or what kind of socket they would fit in.

 

[JimmyM]

Hmmm. 15 AA cells (3 wide) would be 250mm long. 4 Ds is 240mm. Damn, that's close. If you can find a quad bored light and go 4 wide, you need to be 4 cells long, 200mm. It's easier to find a tri-bored body, so you'd have an easier time going with 2/3As, but you loose a little capacity (Elite1700 AAs to Elite1500 2/3A). If you use 4/5As in a tribored 4D body, you are at about 220mm long and have 2000mAh capacity.
You did say that you want to stick with AA cells though.
To get run time out of these higher powered lights you need a lot of capacity. That means bigger bodies.
They'll fit in a standard KIU socket.

The 50W IRC can be found here...
http://www.svetila.com/eProdaja/product_info.php/products_id/4053

 

[LuxLuthor]

This is a starting point in looking at some of the bulb comparisons. Lumens are not accurate, but give a relative comparison to each other.

I keep updating this destructive bulb tests as another reference.