Welcome to my page about "the green laser".
I hope to share some of my first hand observations with you about this product. This is my personal experience with a green laser pointer. Your mileage / results / observations may vary.
Personal message and disclaimer: Please be careful, respectful, and curteous with any laser. Don't point it near the eyes of people or animals. Be careful how and when you use your laser in public. Poor judgement could get you into trouble or get someone hurt. Be sure to familiarize yourself with any laws about lasers in your city, county, state before using.
I saw my first advertisement for a green laser about a year or two ago (2001?). Once they went down in price, I picked one up with some christmas money (ultimately). I am pretty fascinated by lasers (anything science). I thought I was on cloud 9 when I got my first red laser. With a green laser, I am now on cloud 9, squared!
Green lasers are MUCH MORE brilliant (bright) than red ones. While the two lasers I have are the same milliwatt output (less than 5), you can see the green laser MUCH BETTER than the red one, although this was harder than i thought to capture in pictures for you.
So in a house, it is almost bright enough to give you (or your animals if you are using it to entertain them) a small headache after a short time of staring at the dot. might want to stick with the old red laser inside? Although I can sometimes be more sensitive to bright lights than others.
Another example: In a "large, spatious warehouse-type building where you might shop frequently", you can shine it to the other end of the store and have no problems at all seeing the dot (and everyone else will probably see it too).
You can even usually see it outdoors in daylight, at short distances.
But at night its a whole different story; not only can you shine the point on just about anything in line of sight, but you can also usually SEE THE BEAM, depending on your surrounding lighting.
No, it doesn't have to be foggy. However, the darker it is, the easier it is to see the beam at night. That means you probably won't be able to see the beam very well standing in a parking lot with lots of lights on, or even a few. But out in the country where there are little or no lights, you can feel like you are touching the stars!
Furthermore, the more in line you are with the beam's direction, the more visible the beam is. That especially means standing behind it looking in the direction you are pointing the dot. That means it is harder to see the beam from the side. Foggy conditions should make the beam more visible from the front, side, or behind. Have yet to get a foggy night (or day) to try it.
Further example: If you are holding the pointer, and people are standing near you they should be able to see it, even on a clear night. This makes it great for pointing out constellations and stars.
I HAVE been able to shine it on / into the clouds, too. This depends on how low the clouds are, and how well defined they are.
So I have tried to briefly spell out the plusses and minuses of the green laser for you with pictures and with words.
I would highly recommend them to any science buffs, stargazers, and other uses where a red laser just doesn't give you the "punch" you want.
About the pictures: The three night shots on this page were take with 15 second shutter at F2.0. I used a tripod to attempt to steady my hand for the pictures (although it didn't always help; holding a laser steady at 100ft or more while it is 8 degrees F and you have been out there freezing for a while already is fairly difficult). :-)
You can see the red dot and the green dot. If you look close (or turn up the brightness on your monitor), you can see stars, treelines, and some ground features (like snow, neighbor's driveway, etc). The bright light just above and to the left of the laser dot is a street lamp on the other side of the trees. There was a bright moon to the right side of the picture casting minimal light. In the picture of the green dot, if you look closely, you can see the green beam leading up to the dot from the left side. In both dot pictures, the laser was about 6 feet to the left of the camera, and its dot is just above and to the left of the center of the picture.
For reference, here's a picture taken during the day to give you an idea of the distance. Purple X marks about where the laser dots appeared at night.
Here's some ready-made smaller pictures if you want to email them to someone (red, green, touch). Of course, you could email them a link to this page.
Here are some intersting details from the advertisement I purchased from.
Leadlight GPL-105 model. This is not a toy - not for children. All metal construction. Metal gift box. A collimating lens causes the "dot" to be sharply defined. This is a CW (continuous wave) pointer. I do not stock the pulsed models. Always insist on seeing this FDA sticker before purchasing any laser pointer.
"Is yours DPSS?" They are all DPSS - Diode Pumped Solid State - This refers to the method of generation of the laser light and is, to my knowledge, the only way to make a green laser pointer.
"Does it have a range of 2 miles - 15000 feet - shine on clouds - etc. etc -???" How far the dot will be visible depends on how much ambient light is present and the quality of the lens keeping the dot size small to concentrate as much optical power as possible on the target. The Leadlight Pointers have a very high quality glass lens.
"Is yours "High Quality" "True" "Actual" "The Ultimate?" I only know of two manufacturers of green laser pointers: Changchun New Industries Optoelectronics Tech. Co. Ltd. of mainland China and my supplier , Leadlight of Taiwan. Both companies are good reputable manufacturers who do their best to produce quality products for the world market.
My choice of the Leadlight product to import was made from two important specifications as given by these companies for their green laser pointers.
The most important difference is the spec for beam divergance. The Changchun is spec'd at <1.5 mill radians.The Leadlight is <1.2. This means that the Leadlight will maintain a smaller dot for a much greater distance than the Changchun. This is also an indication to me that the qualities of the optics of the Leadlight are superior.
The second factor is that of Power Consumption (battery life). Leadlight specs a power consumption of 350ma at the full 5mw. They claim that this is the lowest on the market. Changchun does not publish this spec. To an old engineer like myself efficiency is an indication of quality.
Here are the websites of the two companies so you can check this for yourself.