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diy blu-ray reliability

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benston89

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Noob here, please excuse me if this has been answered a billion times, but how long do the diy, blu-ray lasers last? how much power is needed to light smokes?
400+?
 





i'm still farly new but if you read the forums all this info is right there at your finger tips i would not sugest lighting a cig with a laser as you can blind your self rather eazy even with protective glasses that cover 405nm it would be realy eazy to hurt your self and eyes can not be replaced

Cheers mate
and welcome
 
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^^^^What he said plus a 400 or 500mW would probably light one in a few seconds. You would definitely want to put the laser kind of under your chin pointed towards the end of the cigarette so the laser is pointing away from your eyes and skin.
 
It is possible to light a cigarette without having it in your mouth at all... regardless, a laser isn't my first choice of cigarette lighter. It is a cool idea, but it takes a long time if you just hold the cigarette and focus the laser on it, and the angles you need to hold everything to even begin to be kind of safe are downright comical. It's a pain in the ass to have a friend help you, plus I wouldn't trust a laser to just any friend. All in all, a cigarette lighter is a MUCH better way to go.. and cheaper too!
 
if you use an additional lens, you could probably do it with 150-200mw

Edit: Ooops, I thought it said green for some reason
 
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Thanks for the replies, but what I really wanted to know was how long they last. (I did search)
 
BR diodes will last any amount of time, some burn out immediately, some go over 1000 hours, but if it is a decent diode and is run at a conservative current, for that diode, if free from shocks, (electric or kinetic), and if the duty cycle and heat sink keep it from getting too hot, I would say 1000 to 4000 hours is typical, Sorry there are a lot of ifs! -Glenn
 
what he said, normally a diode at a "safe current" and heat sinked properly will last for some thousand of hours of continous use :o
 
scopeguy20 said:
BR diodes will last any amount of time, some burn out immediately, some go over 1000 hours, but if it is a decent diode and is run at a conservative current, for that diode, if free from shocks, (electric or kinetic), and if the duty cycle and heat sink keep it from getting too hot, I would say 1000 to 4000 hours is typical, Sorry there are a lot of ifs! -Glenn
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What Glenn said. Treat it like a baby and it should last a while, unless you get a fluke that dies unexpectedly.

Don't over drive it, don't subject it to G forces (dropping it), don't store it in hot/damp places, don't let it get hot and it should last you a while.
 
Thanks. Also, I understand that the red and blue laser have to be more powerful than the greens to show up as well. I have a 50mw greeny, how powerful would I need a red or blue to be comparable (able to see beam really well at night). Which ones (if any) allow you to see the beam during the day?
 
benston89 said:
Thanks. Also, I understand that the red and blue laser have to be more powerful than the greens to show up as well. I have a 50mw greeny, how powerful would I need a red or blue to be comparable (able to see beam really well at night). Which ones (if any) allow you to see the beam during the day?
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Green will always be brighter. I'm not sure the actual ratio, but it maybe be 10:1. Green being 10 times more visible at the same power than red and blu-ray. Just a guess though, someone correct me if I'm wrong.
 
bryce007 said:
Green will always be brighter. I'm not sure the actual ratio, but it maybe be 10:1. Green being 10 times more visible at the same power than red and blu-ray. Just a guess though, someone correct me if I'm wrong.
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I actually think it's closer to 1 green : 4 blu ray and 1 green : 60 red. So you would need 200mW blu ray to match your 50mW green pointer and 3W of red to match your 50mW green pointer.
 
ZRTMWA said:
I actually think it's closer to 1 green : 4 blu ray and 1 green : 60 red. So you would need 200mW blu ray to match your 50mW green pointer and 3W of red to match your 50mW green pointer.
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Yea I think you're closer. Because the blu-ray beam is much easier to see than the red, with no fog present.
 
I did an experiment awhile back and ran a PHR 24/7 at 90mA in a good lab-style heatsink. It died a couple months ago after ~4600 hours. Each diode will be different, so I currently have a second PHR going at the same current in the same heatsink and it's run well over 1000 hours so far. Also it's important to ground out the case pin on the diode (connect it to the negative pin). Blu-ray diodes are electrically floating, so grounding the case helps protect the diode from ESD.
 
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ZRTMWA said:
I actually think it's closer to 1 green : 4 blu ray and 1 green : 60 red. So you would need 200mW blu ray to match your 50mW green pointer and 3W of red to match your 50mW green pointer.
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What? You need a lot more than 200mw of bluray to get it as bright as a 50mw green. Red brightness = bluray brightness imo.
 
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