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laser scare (on film)

mikeeey

mikeeey

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I was messing around with my laser and shades, when all of the sudden it goes out. I freaked out, as you can see...

YouTube - laser scare


luckily it was just the battery.

Don't you hate it when this happens? It's the scariest feeling ever. Still, I prefer it over a laser dropping power when the battery drains.
 
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mikeeey

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What happened to the posts?? my original post is #6. This must be fixed!:p
 
OutlawZ

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Lol.. what kind of shades are those and what kind of laser is that?
 
mikeeey

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I got the shades from focalprice for about $9. I was expecting the "cheap" ones like displayed in the pictures, but instead they sent me the nice $40 pair that are identical to the Wicked Lasers shades. I know because I payed $40 2 years ago for a blue pair that blocks 650nm. I took some side by side pics, I'm gonna post a review somewhat soon.

Here is the "cheap" pair I purchased, but they sent me a nice pair:
http://www.focalprice.com/HH054R/AntiGreen_Laser_Glasses.html

now it looks like they actually have the nice pair as a seperate item, and it costs even less???:
http://www.focalprice.com/LP076X/Professional_Anti_Green_Laser_Glassess.html

The laser is my new 250mW Pocket Mini Blu ray, running on a 6x GGW diode.
 
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Rob

Rob

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Focal price sent me the same goggles as well. I was quite pleased.

As to your topic, the same thing happened to me a few days ago. I was using my new Mini Green and poof, it went out. I freaked but it was only the battery. Very scary feeling.
 
mikeeey

mikeeey

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FireMyLaser said:
You saw what I did thar...
Click to expand...
lawl yes, that's basically what was going through my head when it went out.

btw, how can I calculate my laser's lifetime?
I'm using a 880mAh battery, and my laser draws 190mA, however it's using a flexdrive so it has to make 3.6V higher, and doesn't that use some of the mA?
 
OutlawZ

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I'm going to buy one of those $8 laser shades because i need some shades.. :D
 
charliebruce

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mikeeey said:
l
btw, how can I calculate my laser's lifetime?
I'm using a 880mAh battery, and my laser draws 190mA, however it's using a flexdrive so it has to make 3.6V higher, and doesn't that use some of the mA?
Click to expand...


190mA at 5.5V = 1.045W to diode

1.045*1.15 = 1.20175W from battery (inefficiency due to flexdrive, estimate only)

Battery: 3.6v * 0.88Ah = 3.168Wh available

3.168/1.202 = 2.6356h

So theoretically, you have just over 2 1/2 hours. However this presumes several things:
  • The flexdrive consumes 15% of the diode's power as heat in inductor/chip
  • The battery's true capacity is 880mAh (Chinese false advertising)
  • The battery runs at an average of 3.6v for its useful lifetime
  • The diode's forward voltage is 5.5v when run at 190mA
 
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mikeeey

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thanks charliebruce!
+1

Is there any simple way I can test that my battery is really 880mAh? Will a multimeter show this?
 
charliebruce

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Hi,
The only way of testing the battery's capacity accurately is to use a professional bettery tester (not a normal multimeter!), but you can measure it reasonably accurately by discharging it at a constant rate (say, using a resistor, and turning its resistance down as the battery's voltage drops), and seeing how long that process takes. It's probably not worth doing this though, because there are so many variables (battery life, temperature, discharge rate). The maths above would only give a theoretical estimate, only gives a "ballpark figure", and assumes lots of variables.
 
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