Old 03-08-2014, 08:21 PM #17
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Default Re: Best Laser for Starting Campfires?

I'd spring for the 9mm diode, then just drive it at a safer current. I've had two die at 2.5A, so if you got one and set it closer to 2A, you could get a nice long lived 445nm burner doing somewhere in the area of 2.5-3W. 2.5A can give power above 3W, but I have been unlucky with that, so don't recommend it

I think boost drivers use one battery, but make sure, because I'm not sure. If you live in the U.S. go to Lighthound for batteries


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Old 03-08-2014, 08:49 PM #18
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Default Re: Best Laser for Starting Campfires?

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Originally Posted by Shakenawake View Post
I'd spring for the 9mm diode, then just drive it at a safer current. I've had two die at 2.5A, so if you got one and set it closer to 2A, you could get a nice long lived 445nm burner doing somewhere in the area of 2.5-3W. 2.5A can give power above 3W, but I have been unlucky with that, so don't recommend it

I think boost drivers use one battery, but make sure, because I'm not sure. If you live in the U.S. go to Lighthound for batteries
Alright so after looking at the 9mm, it looks like if I was to go that direction I would get it here and probably go for the $88 option (445nm 9mm Diode In V4 Copper Module W/Leads) Is this sufficient to replace the M140 with? It says stock lens will be included but I'm not really understanding this so it this going to come with a better lens with the stock one separate or what? Maybe someone knows who has ordered from him before. It doesn't look like he has any drivers in stock to support the 9mm, so I think I would probably get this one. $10 less and will go all the way to 3A. Yeah it says on DTR's site that 2.3A is ideal for this diode, so I will probably set it at 2.3A. So it will only end up being $18 more. But is a diode in the C6 host with the baseline C6 heat sink going to be enough to keep a 2-3W laser cool enough? It is going in the C6 with the regular aluminum heatsink so i don't want to get a nice diode like this only for it to overheat. So are these the only things I am going to need to replace? Are these going to give me the best options? Thanks.

As for batteries, it looks like the 18650 will be the better option for me(I think). You said use Lighthound, but those look very over-priced. The tutorial I was looking at say to use brand name batteries for best performance, here are two panasonic ones on amazon for the price of one on light hound, and here looks like the high quality charger I have seen. Of course the panasonic ones are unprotected versus protected for the light hound one, but I think with the nicer charger over-charging shouldn't be too much of an issue (but idk).

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Old 03-09-2014, 04:04 AM #19
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Default Re: Best Laser for Starting Campfires?

those batteries and charger should be fine.

I would stick with no more than 2 minute duty cycles. 2.3A is still a little high, IMO, though plenty people around here do it. I'd sacrifice 300mA to improve the life of the diode, it will not drop the output too much, I think it should still be over 2W at that setting, even with a 3 element lens. not 100% sure on that, DTR may know more. the stock lens is the one all those 9mm diodes come with, but they don't allow the laser to be focused and cant be pressed into a module while it is still on, so many discard them and put on a g lens or 3 element. I'd spring for an o-like lens, here: New405/445/515nm Blue laser collimation lens /98%/ M9*9mm [OL-405-G-2] - $10.99 : Zen Cart!, The Art of E-commerce

there was a GB on them but it ended. still, these perform much like the g lenses but cost about as much as a 3 element
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Old 03-09-2014, 04:08 AM #20
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Default Re: Best Laser for Starting Campfires?

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those batteries and charger should be fine.

I would stick with no more than 2 minute duty cycles. 2.3A is still a little high, IMO, though plenty people around here do it. I'd sacrifice 300mA to improve the life of the diode, it will not drop the output too much, I think it should still be over 2W at that setting, even with a 3 element lens. not 100% sure on that, DTR may know more. the stock lens is the one all those 9mm diodes come with, but they don't allow the laser to be focused and cant be pressed into a module while it is still on, so many discard them and put on a g lens or 3 element. I'd spring for an o-like lens, here: New405/445/515nm Blue laser collimation lens /98%/ M9*9mm [OL-405-G-2] - $10.99 : Zen Cart!, The Art of E-commerce

there was a GB on them but it ended. still, these perform much like the g lenses but cost about as much as a 3 element
So the 9mm I am thinking about purchasing (the $88 one) has a different lens on it besides the stock? Or does it come with the stock removed and there is no lens attached, meaning I would have to purchase a lens. Thanks.
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Old 03-09-2014, 04:38 AM #21
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Default Re: Best Laser for Starting Campfires?

Campfire?? Toss a small wad of steel wool in there !!!!
A little accelerant might help.
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Old 03-09-2014, 05:29 AM #22
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Default Re: Best Laser for Starting Campfires?

Ditto. Fresh 9V battery and a pack of #0000 steel wool -> instant fire.
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Old 03-09-2014, 08:24 AM #23
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Default Re: Best Laser for Starting Campfires?

Quote:
So the 9mm I am thinking about purchasing (the $88 one) has a different lens on it besides the stock?
no, and the stock lens is included unattached from the diode, in the retainer which was originally glued to the diode. they have to be removed before being pressed into the module, which is why you get it unattached. some people around here know more about how to modify a holder to use this included lens, I think it involves boring out an existing lens holder to be wider. to me that seems like such a pain, I personally would just get the o-like lens, it will perform nearly as well. I guess if you have access to a drill press or something it might be better to try and use an empty lens holder and modify it to use the stock lens

Quote:
Or does it come with the stock removed and there is no lens attached, meaning I would have to purchase a lens. Thanks.
you will need to get another lens unless you can figure out how to use the stock lens as I talked about above

wait a minute. I just looked more closely at DTR's site, the description of his lens holders says the stock 9mm lens works with it, so maybe they don't need to be bored out or DTR has solved this problem. if those stock lenses can indeed be used in the lens holders DTR provides, then all you should need is the $95 version of the diode, then remove the lens from it's original retainer and put it into the new holder, carefully. then you can forget the o-like lens
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Lasermax Genesis sight 532nm 5mW
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PL660 from Laserbtb 660nm 1020mW

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Old 03-10-2014, 02:27 AM #24
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Default Re: Best Laser for Starting Campfires?

OK- Chi-town-- we have members there--

I have a +5 rep bump for you once you add that info to your profile-

you cannot expect the entire forum to read your single post w/ your location..

btw I see you made a small faux pas by posting back to back ( called double posting and frowned upon here)-
you can edit that one away and simply paste it into the post above..then delete- only takes a minute to do this and its better that you do it rather than one of the mods- it is OK to bump your own thread ifs its for an item you are selling or looking for- - or if your older post is VERY old and you have new info to add.. you can help friends here by bumping for them. 'necro threads ' can be tricky to post in. so read the OP (check all dates)and make sure you are not making a necro post to a thread that has no need to be bumped---

best wishes---hak
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Old 03-10-2014, 06:19 PM #25
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Default Re: Best Laser for Starting Campfires?

Here's some info from my personal experience using a 3.2W 445 (blue):

- #0000 steel wool (or as fine as you can get), fluffed out and embedded on paper or small kindling nest; just like using a battery, laser will start the steel wool to burn, though not with a flame but little glowing embers; burning steel is hotter than any wood fire so gently blow these embers on to your kindling, fire should start quickly; another thing with steel wool, it will rust quickly so store it in a sealed container with a *small* amount of kerosene or diesel (not immersed in it, just use a few drops)
- directly blasting kindling nest with laser can work as well
- cotton balls (maybe with some vaseline or wax smeared in) will work but can be tricky since they're white, which tends to reflect more of the light energy; once it starts to char it can happen quickly
- using a bit of charcoal to draw like a pencil or crumble it over your intended target will help catch the laser's energy and start things glowing/burning
- similarly, blackened but not completely burned bits of wood work really well since they're prone to bursting into flame instead of glowing and smoldering
- the above tips can also help when using a magnifying glass

My 3.2W will damn near catch anything on fire short of an ice cube so that makes the task easier; lesser-powered lasers might need some of the above tips. A laser that can be focused will be of great help, regardless of power.

Admittedly, using a laser to start a campfire is not the most reliable or efficient, but the COOL factor is hard to beat! Keep a lighter or matches as backup.

You'll want to practice ahead of time to get the technique down. Be safe, especially using any accelerants.
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