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How to identify 30mW from 5mW Green laser ?

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ishareman

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Hey guy here i'm new to this forum. I'm going to buy a green 30mW green laser at the local store. Just want to ask if there are any simple method to identify 30mW from 5mW Green laser cos i don't want to be cheated by bad guy. (i'm absolutly a newbie :-/)
 





any simple test for example will i feel warm when 30mW light beam is projected on my skin or can i see the light ray of a 5mW beam in the sky, or something else?
 
well a 30 mw may  pop a black balloon  ;) but it may not i would try that

oh what are you paying for it not more than 40.00 usd I hope unless its a really good brand

as to actually feeling it naw it usually takes 50-70 mw plus before you feel it
 
john lawson said:
well a 30 mw may  pop a black balloon  ;) but it may not i would try that

oh what are you paying for it not more than 40.00 usd I hope unless its a really good brand

as to actually feeling it naw it usually takes 50-70 mw plus before you feel it
Click to expand...

no i'm getting it for a extremly terrible wholesale price that's why i'm now worrying
 
ishareman said:
[quote author=john lawson link=1233924107/0#3 date=1233924856]well a 30 mw may  pop a black balloon  ;) but it may not i would try that

oh what are you paying for it not more than 40.00 usd I hope unless its a really good brand

as to actually feeling it naw it usually takes 50-70 mw plus before you feel it
Click to expand...

no i'm getting it for a extremly terrible wholesale price that's why i'm now worrying
[/quote]

Buy THIS
http://www.ledshoppe.com/Product/ledp/LP1075.htm
 
If you are going for your first green laser, you can't go wrong with the true DX 30mW. Also chek other dealextreme products, depending on what your money ammount is I would go for the true 30mW or the true 50mW if you want a green laser and for the 200mW burner (red) for 41.50$.

http://www.dealextreme.com/details.dx/sku.469 <--30 green
http://www.dealextreme.com/details.dx/sku.1371 <--50 green
http://www.dealextreme.com/details.dx/sku.11315 <--200 red


Green for outside fun, red for inside fun (bruning oh yes :D).

About distinguishing from 5mW to 30mW it's really hard, the only thing coming to my mind is testing the burning. Take a Scotch piece of tape, extend it as much as you can without broking it while covering the laser output. turn it on and w8, my true 30mW will make a hole on it in one or two seconds. 5mW is not suposed to burn nothing.

Also note that usually 5mW greenies are made just to pass the US regulation, and so they are kinda overpowered, if you dont want to be cheated just buy the one I said you from dealextreme.
 
hmm... see if you can acquire a bead type NTC thermistor and mount it on something that allows it to stand like wood or something not thermally conductive, now color it black to ensure none of the infrared output gets deflected.

Connect it to your multimeter to it and measure the varying resistance, if you can log it please log it, draw a chart per laser. You would first need to get a laser you know thats 5mw, record a table of temperature rise per unit time and compare your two questionable laser's graphs to that graph, if the graph increments dramatically more than the known 5mw you could speculate it has more power output.

It'll be a very general observation since you could argue that the 30mw may have an IR filter where the 5mw did not...yadda yadda and so on...but I'm out of ideas and this is the best I can come up with :-/
 
--Hallucynogenyc-- said:
If you are going for your first green laser, you can't go wrong with the true DX 30mW. Also chek other dealextreme products, depending on what your money ammount is I would go for the true 30mW or the true 50mW if you want a green laser and for the 200mW burner (red) for 41.50$.
Click to expand...

may i know what is the different between "true" and "not true" green laser? :-/
 
Illuminum3415 said:
hmm... see if you can acquire a bead type NTC thermistor and mount it on something that allows it to stand like wood or something not thermally conductive, now color it black to ensure none of the infrared output gets deflected.

Connect it to your multimeter to it and measure the varying resistance, if you can log it please log it, draw a chart per laser. You would first need to get a laser you know thats 5mw, record a table of temperature rise per unit time and compare your two questionable laser's graphs to that graph, if the graph increments dramatically more than the known 5mw you could speculate it has more power output.

It'll be a very general observation since you could argue that the 30mw may have an IR filter where the 5mw did not...yadda yadda and so on...but I'm out of ideas and this is the best I can come up with  :-/
Click to expand...

hi thanks for your answer as i said before i am a newbie and this may be too professional for me :o
 
The "true" are likely to be slightly higher power. No promises though, we're talking chinese milli-watts.
 
Cyparagon said:
The "true" are likely to be slightly higher power. No promises though, we're talking chinese milli-watts.
Click to expand...

I like that one.... "Chinese MilliWatts"..... ;D ;D ;D ;D

Jerry
 
lasersbee said:
[quote author=ishareman link=1233924107/0#0 date=1233924107]Hey guy here i'm new to this forum. I'm going to buy a green 30mW green laser at the local store. Just want to ask if there are any simple method to identify 30mW from 5mW Green laser cos i don't want to be cheated by bad guy. (i'm absolutly a newbie :-/)
Click to expand...

Yeah... you could get one of these..... ::)

http://www.bauer-electron.com/eby/ebayhlpm.htm

Jerry[/quote]
:o I did not know someone made such a thing :o

lasersbee said:
[quote author=Cyparagon link=1233924107/0#12 date=1233978099]The "true" are likely to be slightly higher power. No promises though, we're talking chinese milli-watts.
Click to expand...

I like that one.... "Chinese MilliWatts"..... ;D ;D ;D ;D

Jerry[/quote]

hey now! >:(
but yeah...inflated measurements is more or less internationally accepted marketing strategy nowadays. :-/
Some of us Chinese folks stick to the rules...others don't and we get treated the same, I guess for China theres still that "incentive" issue of honesty
 
Hmmmm my X-25 is rated at about 33mW, and this is what it can do....

1. Can pop sharpied / Black balloons.
2. Beam clearly visible in night sky
3. Hit clouds easily at dusk
4. Slooooowly burn through black coloured scotch tape ( the real thin stuff). That was with fresh batteries from a close distance.

A 5mW would fall severely short of the above descriptions. Only real way to be sure is to get it tested with a LPM....Laserbee much?
 
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