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I can't disagree more. The swine's are making a nice profit selling laser with blatantly dishonest claims. Barring any public agency to keep an eye on them the only way to stop it is either private litigation or people like us to cut into their profits with LPMs.

Last I heard a human at rest would produce app. 100W. Some of the heat would be disposed of as heated breathing air, some by air heated by skin contact and some as blackbody radiation. I have had the opportunity to handle some really fancy thermal binoculars and seen the thermal signature of a...

The 20 sec is the crystal setup being warmed up to working temperature. A poor quality laser is very likely to have such issues and it is more or less impossible to fix.

It sounds like you are mistaking the initial reading for initial laser output. The meter works on the temperature difference between the sensor and the cooling plate it is mounted on, it will take some time for the laser to heat the mass of the sensor and show true power. Your 445nm laser does...

Well it is simply a combination of poor quality control and the US limitation of 5mW on import lasers. It means that the really low end crystal setups will be sold as 5mW no matter what they produce.

Thanks for the heads up. I am used to honest dealings over the net and find the Laserman behaviour inexcusable.

One problem is that low cost 0-50mW lasers, particular pen-style are rarely power tested. You could just as well buy 5mW pens from ebay, they will be somewhere between 1 and 40-50mw. I recommend that you get some goggles and a good quality tested first laser. Laser Safety Goggles EP1 For...

How about you just lower your expectations of that pen down to 1mW level? My signature contain a link to Odicforce, it is in the UK and carry good quality products. Don't forget goggles for anything above 5mW. They tend to cost more than the laser, and if you don't want to spend that much get...

Odicforce is in the UK. I have these myself. http://odicforce.com/shop/article_OFL52/Laser-Safety-Goggles-EP1-For-190-540nm-_-800-2000nm-%28Green%2C-IR-and-Blu-ray-Lasers%29.html?shop_param=cid%3D20%26aid%3DOFL52%26

And how exactly are you going to determine output? :whistle: If you are very lucky it will be somewhere between 50 and 100mW.

Entertaining project. The closest I have been were putting a 250W halogen work light in a 2-man tent. It looks really cool from the outside, but does not work outside e.g. a festival employee camp, electricians corner. :D

I have only purchased there once, but have the impression of a good store with excellent support and a thing for happy customers. (There were a partial error in my order, when notifying them I got an immediate response and the correct item were sent right away.)

You have had some nasty examples of emergency services not working too well, Katrina is one, and there were rather long riots some decades ago. A breakdown is not just determined by how well FEMA or equivalent is working, but also by peoples perception of it. If enough people believe society...

I live in the centre of Copenhagen, the capital of very safe and stable country, so the whole "survivalist in the wilderness" mindset looks like a silly foreign hobby. :) We recently had a rainstorm leading to power outages, sewer water in cellars, and trouble getting around. I have...

Re: New Boost Driver in Dev *Asking for investors* Western Union is non-traceable and loved by Nigerian princes. :( In this case it just means you will have no hold on him whatsoever. It would be a really bad idea.

It looks like all stainless. The only care I can think off is to blow the pocket lint out of the locking mechanism now and then. :D

I am just trying to be helpful, and it reminded me of a discussion of the optical/focus problems arising from treating real life light sources as points.:beer:

No, a LED is not a point source, it is a "several/lots of millimetre square" source. Incandescent or HID bulbs are closer to being point sources and therefore easier to focus in spotlights/throwers. I agree that you should not look into a LED light.

Sorry, I had some plans involving direct driving a LED in a small custom heat sinked light*. Unfortunately one vessel had a lousy lathe, then I did not get the lights with me, and now I am looking for a new temp job. Personally I have a tiny light on my key chain and a selection of 150-250...

You could have a 8-900 lumen with just one 18650 and fit it in your jacket pocket. Jeans pockets are limited to 2-300 lumen. Unless you are capable of some customising. :D