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- Feb 16, 2015
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I know naff all about lasers which is why I've joined this forum, hopefully to learn a little before I blind myself or someone else.
I recently bought some lasers from China to point out the stars and impress my GF - all were under US $10.00.
First was a green laser from FastTech branded 'DX dealextreme' !! - it states it is <5mW. The beam is not visible in daylight but it will cast a small but visible spot onto a bell tower 275m away at night. The beam is quite thin but ok as long as there's not too much ambient light.
When I first got it I thought it wasn't working as it was very dim but what I have worked out is the laser head needs to be warmed up before it will get bright - sticking it under my arm pit for 5 minutes does the trick --- is this normal?
Hoping for a better beam I got a purple laser from ebay branded 'VL Laser 303' - it states it is <100mW. I was very disappointed with this laser which had a very thin faint beam at night and was useless for pointing out stars.
It seems to have died as it will now only produce a very, very dim spot on an object 6 inches away --- is there anything I can do to try and fix this?
I've just received the last green laser I ordered - from a dealer on Ali Express - this one is branded 'Laser 301' - it states it is < 10000mW !!!!
The beam is visible in daylight and very strong at night - it will project a bright spot (i estimate about a 1 feet in diameter) onto the side of a 29 story building 1.4Km distant
I'm sure it can't be 10 watts but would like to know what it's pumping out --- could someone point me in the direction of a very cheap meter and a decent pair of safety glasses?
Actually this last laser has scared me a little and is what has prompted me to join this forum :beer:
Steve.
I recently bought some lasers from China to point out the stars and impress my GF - all were under US $10.00.
First was a green laser from FastTech branded 'DX dealextreme' !! - it states it is <5mW. The beam is not visible in daylight but it will cast a small but visible spot onto a bell tower 275m away at night. The beam is quite thin but ok as long as there's not too much ambient light.
When I first got it I thought it wasn't working as it was very dim but what I have worked out is the laser head needs to be warmed up before it will get bright - sticking it under my arm pit for 5 minutes does the trick --- is this normal?
Hoping for a better beam I got a purple laser from ebay branded 'VL Laser 303' - it states it is <100mW. I was very disappointed with this laser which had a very thin faint beam at night and was useless for pointing out stars.
It seems to have died as it will now only produce a very, very dim spot on an object 6 inches away --- is there anything I can do to try and fix this?
I've just received the last green laser I ordered - from a dealer on Ali Express - this one is branded 'Laser 301' - it states it is < 10000mW !!!!
The beam is visible in daylight and very strong at night - it will project a bright spot (i estimate about a 1 feet in diameter) onto the side of a 29 story building 1.4Km distant
I'm sure it can't be 10 watts but would like to know what it's pumping out --- could someone point me in the direction of a very cheap meter and a decent pair of safety glasses?
Actually this last laser has scared me a little and is what has prompted me to join this forum :beer:
Steve.
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