Heat!

[mknewman]

I recently got my first incans, a FM 3x26500 body with G4 Sunlight and FM1909 bulb and AW Softstart. Amazingly bright, tons of flood, but my oh my this thing makes heat like I can't believe! If I run it on high within a minute the head is too hot to touch and the battery tube is starting to heat up. I haven't been brave enough to let it go much past that, I don't want to see what an IMR does when it gets hot enough! It gets hotter in 1 minute than my SST-90 lights do in 20 minutes!

I've been bugging FiveMega to make some Titanium battery tubes. I think this is the perfect application, a battery tube that won't transfer heat (as much).

Any comments?

Marc

 

[DM51]

A tube made of material that is worse at transferring heat would help to keep the heat inside the tube, which is bad - the last thing you want is your cells getting even hotter than they already are.

 

[mknewman]

The heat is up at the head, where the bulb is. The only way heat is going to get back to the battery tube is the threads (low conductance Titanium would prevent that) the spring, which is pretty minimal, and and radiance, which from the rear of the P60 module could be blocked by a simple disk of an insulator around the spring. I've heard of people using a paper tube wrapped around the cells, that provides a simple insulator. But my thought was use the Ti tube to keep the heat up front.

 

[mknewman]

Any thoughts on this http://www.rubbersheetroll.com/neoprene-rubber-flame-retardant.html ?

 

[Billy Ram]

The bulb tower on the FM 3x26500 is machined into the body and does a good job of transfering heat. Mine gets warm but not too hot. I have a FM 4x26500 with the KU socket/heatsink that doesn't get as warm running the same FM1909 bulb and 3x26650s. Now my m*g458 will get a bit warm.
Billy

 

[ShineOnYouCrazyDiamond]

I have the same setup at OP except using FM D36 reflector. The 1909 puts out a LOT of watts but the flashlight can handle the heat. I've run it for a good 5-10 minutes straight and it get's hot but the cells aren't going to fry.

Don't forget that to human skin 120F degrees is enough to feel like burning hot. Have you measured the exact temps with an IR temp meter?

 

[65535]

Using insulation behind the reflector and above the batteries is probably a good idea in these super hot lights. If you want a grip insulator so you don't burn yourself (batteries and switches are less heat sensitive than you are)
McMaster part number:
8623K147


Should do the trick 450F max operating temp.

 

[fivemega]

I think mknewman is talking about this host and this LA

Billy Ram is talking about this host.

And ShineOnYouCrazyDiamond is talking about this host.

Even though all 3 using same IMR26500 batteries and FM1909 bulb but each host may react differently to heat.

Third one has one pice finned head/body, second one has seperated/isolated lamp holder and battery compartment with bigger head while first one has none and much more compact.

Heat isolated battery tube is a good idea for batteries and friendly to handle but heat will increase quickly at head area because of poor heat dissipating.

 

[mknewman]

I believe FM is correct about the hosts we are talking about, I have both the FM 3x26500 with the D36 and the one with the P60 heads. The P60 head one really needs a turbohead, it's so hot with a FM1909. Great bulb but it gets so hot in 90 seconds I get worried and turn it down or off.

I may have to stop over at Lighthound and see what they have.

Oh, 0xffff thanks for the link. I love McMaster Carr, they have EVERYTHING! I do think that stuff might be too thick though at 1/8".

 

[Justin Case]

I recently got my first incans, a FM 3x26500 body with G4 Sunlight and FM1909 bulb and AW Softstart. Amazingly bright, tons of flood, but my oh my this thing makes heat like I can't believe! If I run it on high within a minute the head is too hot to touch and the battery tube is starting to heat up. I haven't been brave enough to let it go much past that, I don't want to see what an IMR does when it gets hot enough! It gets hotter in 1 minute than my SST-90 lights do in 20 minutes!

I've been bugging FiveMega to make some Titanium battery tubes. I think this is the perfect application, a battery tube that won't transfer heat (as much).

Any comments?

Marc

Maybe try one of FiveMega's Deep Turbo C Heads.

 

[Swagg]

Maybe try one of FiveMega's Deep Turbo C Heads.

Man I'd love to see how the beam looks with that paired with the 1909, that should be pretty much like a lazer with the hotspot that TH makes! Any beamshots anyone? Sorry don't mean to derail...

 

[ShineOnYouCrazyDiamond]

Yeah - you guys are right. I had remembered that mk had the D36 3x26500 because we pm'ed when I was thinking about getting the same setup.

I don't want to de-rail the heat topic - but the 1909 in a FM3X head is a real laser as well. Makes the 1185 in a M6 look like a dull beam.

If the OP doesn't mind I'll take and post a few pics later on.

 

[Billy Ram]

Here's what the FM1909 looks like with the Throwmaster head.

Big pine tree 100yds.
Billy

 

[Swagg]

What about the original setup (1909 D26) paired with the Deep C TH? That TH makes such a tiny hot spot I wonder what it would look like with this LA?

 

[Swagg]

I recently got my first incans, a FM 3x26500 body with G4 Sunlight and FM1909 bulb and AW Softstart. Amazingly bright, tons of flood, but my oh my this thing makes heat like I can't believe! If I run it on high within a minute the head is too hot to touch and the battery tube is starting to heat up. I haven't been brave enough to let it go much past that, I don't want to see what an IMR does when it gets hot enough! It gets hotter in 1 minute than my SST-90 lights do in 20 minutes!

I've been bugging FiveMega to make some Titanium battery tubes. I think this is the perfect application, a battery tube that won't transfer heat (as much).

Any comments?

Marc

So does the entire body get hot eventually? Soon I'll have a similar set-up using Leef Big C body.

 

[mknewman]

The front of the d26 light with a tiny Solarforce P60 head gets so hot on high after 90 seconds to 2 minutes I get scared and turn it down or off. The body starts to heat up as well but I don't let it go too far as I don't want a battery to get unhappy. The D36 version is much better behaved, I can leave it on longer because it has all that finning.

That 1909 is one heck of a bulb.

 

[Swagg]

I was thinking about running this bulb on my Leef with an M2 head which is slightly larger in size, I wonder if that would make any difference in heat? You've got me second guessing my setup which isn't complete yet...

 

[mknewman]

Well, the light's basicly a toy with either the D26 or D36 version because it's so long with 3x26500's there is no way you'd carry it, except maybe as a replacement for a batton!

 

[Swagg]

I actually enjoy that length for around the house and walking the dog. I wanted this setup in the D26 for a room sweeper just pure flood and power, something on my bedstand ready to blast when I need it. But out and about I like the one or two cell setup which I have several other LA's for.