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Old 10-25-2010, 08:27 AM   #1
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Default Feel the Heat. I need a mass advisory.

I built my 445 all copper SS 18650 host running a Micro Boost drive and the duty cycle is about 6 minutes before it is too hot to hold. (Almost to touch)

Anyhow, I wanted to know how the heat of the 12x Blu-rays compared to the heat generated by the 445s. I was thinking about using a SS C3 host instead just as a change of pace. It sounded like a great idea until I started to think about, (you probably guessed) heat. I know the higher the current, the higher the heat, but is it as much as the 445s? I figured I would run it around the zones DTR run it. Oh yeah, its the sled from Rayfoss.

So yeah, do you people think?
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Old 10-25-2010, 10:46 AM   #2
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Default Re: Feel the Heat. I need a mass advisory.

im not to sure but my 445's gets verry hot verry fast compaired to my 12x's but then again my 445's run at about 1000ma and my 12x's 400/500ma i have a 12x running 500ma in a Ultrafire A10 14500 host takes quite some time before it gets warm..
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Old 10-25-2010, 10:51 AM   #3
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Default Re: Feel the Heat. I need a mass advisory.

12X will not heat up as much, and it should be fine with a duty cycle (though probably a long one). the 445s are not very sensitive to heat but if it becomes to hot to hold you should NOT be leaving it on. You say at 6 minutes...try maybe 4 min on 2 min off?
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Old 10-26-2010, 12:22 AM   #4
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Default Re: Feel the Heat. I need a mass advisory.

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12X will not heat up as much, and it should be fine with a duty cycle (though probably a long one). the 445s are not very sensitive to heat but if it becomes to hot to hold you should NOT be leaving it on. You say at 6 minutes...try maybe 4 min on 2 min off?
Well Duh I ran it for 6 min to see how it sucked the heat.

How are people achieving these crazy 30 minute tests. In the hosts.
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Old 10-26-2010, 01:04 AM   #5
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Default Re: Feel the Heat. I need a mass advisory.

Well, to put some figures on it...

P = I x V

Therefore...

a 445nm running 1Amp and at 4.2V will show a total power output of 4.2W. Assuming it's outputting 1W as light, this means it's disappating 3.2W as heat.

A 405nm running 500mA and at, say 7V, (possibly an over estimate), will show a total power output of 3.5W. Assuming it's outputting 700mW then it will be disappating only 2.8W as heat.

Efficiencies differ and the two could end up being pretty close but it doesn't take into account the heat from the driver.

I'm not sure how you'd work that out but that should illustrate the point.

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Old 10-26-2010, 01:12 AM   #6
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Default Re: Feel the Heat. I need a mass advisory.

So the bluray is less, ok.

Hmm hosts and their choices....Damn
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Old 10-26-2010, 01:17 AM   #7
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Default Re: Feel the Heat. I need a mass advisory.

That depends on what you run you it at but the point is they are close.

Any host that heats to a point you can't touch it will likely do the same with a 12x but just take a slightly longer time to get there.

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Old 10-26-2010, 02:05 AM   #8
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Default Re: Feel the Heat. I need a mass advisory.

Well of course. I do have a brain I think I will have to get another SS 18650. They are sure yummy.
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Old 10-26-2010, 02:26 AM   #9
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Default Re: Feel the Heat. I need a mass advisory.

Well, if the host got hot it means it IS effectively dispersing heat, but Some longer run times are achieved with either a direct pressed diode where it is directly pressed into the heatsink resulting in better contact, as well as using thermal adhesives instead of super glue or such. You might also want to do the 445 OR the 12x in that host but if you can get ahold of a flaminpyro MAXSINK, or a large computer heatsink, you could drill it out to fit around the head of the host and then set it with the thermal adhesive. May not look as pretty but if you do it right it will look ok, just not as sleek.
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Old 10-26-2010, 08:02 PM   #10
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Default Re: Feel the Heat. I need a mass advisory.

Quote:
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it is too hot to hold. (Almost to touch)
Cut it out. You're gonna kill it if you haven't already.
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Old 10-27-2010, 01:44 AM   #11
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Default Re: Feel the Heat. I need a mass advisory.

Don't tell me what to do. I can light my house on fire if I want to.

I was testing it.
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Old 10-27-2010, 02:43 AM   #12
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Default Re: Feel the Heat. I need a mass advisory.

Toaster --

Sorry, I can't resist anymore!!!!!

If you are feeling heat, You better go to Mass next Sunday !!! jk

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Old 10-27-2010, 02:48 AM   #13
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Default Re: Feel the Heat. I need a mass advisory.

This Mass? Lol
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Old 10-27-2010, 02:50 AM   #14
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Default Re: Feel the Heat. I need a mass advisory.

Toaster --- you got it :-)
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Old 10-27-2010, 04:28 AM   #15
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Default Re: Feel the Heat. I need a mass advisory.

Lol cool
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Old 10-28-2010, 11:08 AM   #16
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Default Re: Feel the Heat. I need a mass advisory.

Look at this : Flexdrive Driver Heatsink for Continuous driver duty cycle @ 1.5A if you have room in the host of course
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Old 10-28-2010, 05:08 PM   #17
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Default Re: Feel the Heat. I need a mass advisory.

Why would I need that? I have seen that before and I know what I am doing for the most part, Just needed info for heatsinking the diode. I think the driver will be fine.
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Old 10-28-2010, 06:53 PM   #18
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Default Re: Feel the Heat. I need a mass advisory.

All we can suggest is attempt mo get better efficiencies in your diode through driver adjustments, as Morgan said, get a larger heat sink also one that will fit tight enough that you have to press fit it in. Maybe a larger host.
Also you could get fancy and use a more efficient heat sink than copper and thermally isolate it from the host it's self, rarely seen on LPF.

other than that, if you want same host, all I can do wish you best of luck!
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Old 10-28-2010, 09:48 PM   #19
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Default Re: Feel the Heat. I need a mass advisory.

You said it got hot, but you didnt open it up after and check how hot the diode was. These flexdrives can heat up a LOT at 1+ amps. If you ran it with no heatsink and kept a finger on the flex, you would feel it getting warm, almost as warm as the diode itself. so yes you would need that for run times over 5 min.
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Old 10-28-2010, 11:44 PM   #20
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Default Re: Feel the Heat. I need a mass advisory.

I am not saying I want 5 min runtimes. I never said that. Just for general purpose. Also I am not using a flex, you want to use boostdrives on BRs anyway.

ALSO diode are in a heatsink so how would I feel that? I can feel the heatsink. Running BR at 1 amp is death. SO why Would I go over 1 amp.

Engage brain before the typing
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Old 10-28-2010, 11:52 PM   #21
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Default Re: Feel the Heat. I need a mass advisory.

Aren't you talking about 445......and you asked how people are getting these 15 min runtimes, I didnt say you had to, I said that is HOW.
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Old 10-29-2010, 02:08 AM   #22
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Default Re: Feel the Heat. I need a mass advisory.

hehehe this thread is great, toaster I think you're going to get more worked up than helped today. or youll just listen to people helping and don't do what you don't wnat and do what you want.. instead of burning your house down
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Old 10-29-2010, 02:11 AM   #23
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Default Re: Feel the Heat. I need a mass advisory.

^^This
Just do what you want. You asked the question, and you get answers. You may not share the same opinion as us all but people are just trying to help
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Old 10-29-2010, 03:04 AM   #24
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Default Re: Feel the Heat. I need a mass advisory.

Quote:
Originally Posted by Toaster View Post
I am not saying I want 5 min runtimes. I never said that. Just for general purpose. Also I am not using a flex, you want to use boostdrives on BRs anyway.

ALSO diode are in a heatsink so how would I feel that? I can feel the heatsink. Running BR at 1 amp is death. SO why Would I go over 1 amp.

Engage brain before the typing
I hate to say this Toaster but a Flexdrive IS a boost driver. However, you're half right. You might not be able to use a Flexdrive with a 10x or a 12x BR as the Flexdrive may not be able to put out enough voltage. You will want a MicroBoost driver.

With a high power BR you should be okay without heatsinking the driver. You know this as you know you won't need to push it anywhere near maximum. The thermal shutdown would kick in anyway to let you know if you needed to modify anything but at the 500mA max that you'd need... Shouldn't be an issue. It is true though that most of the limits on duty cycle for the high end 445nm are down to the driver overheating and not the diode or host. That's why heatsinks for drivers have become popular recently; they work.

@ Lasers and Masers - I'm not sure what you mean by a more efficient heatsink than copper? Or how thermally isolating it from the host would improve things? I think this would make your life more difficult.

M
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Last edited by Morgan; 10-29-2010 at 03:09 AM.
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Old 10-29-2010, 03:22 AM   #25
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Default Re: Feel the Heat. I need a mass advisory.

Quote:
I think this would make your life more difficult.
That's exactly it.. the "also" was signaling (a signal is a discrete part of a communication)
that it was nonsense in the fact that copper is a great heat conductor and also that people on L.P.F. do just fine in apparently other ways.
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