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It depends on whether the driver can boost voltage from a single AA. $6.31 20mW 405nm Blue-Violet / Royal Purple Dot Laser Module at FastTech - Worldwide Free Shipping If this is the exact module you got, it states input of 3-5V, meaning you will need to use a lithium ion 14500 cell, preferably...

If it's just going to be a display piece, why not just make it stationary and aim it at a well-disguised mirror on a stand? Think saber hilt, pointed at a mirror, both items bolted to a stand to make them stationary relative to each other. Mirror would be mounted on, iono, clear plexiglass, or...

I was hoping someone would take the truck's side! He wasn't tailing her THAT badly. I get a tail closer than that twice a week, but never when I'm in the passing lane. He should have flashed his lights to let her know that he wanted to pass her. That is one of my biggest peeves. I once...

It's the draggy portion of a boat anchor for a tiny boat. Usually, these are used for boats in fishtanks, to keep the boat from floating off to sea.

What are your thoughts on the k40 vs. k50? I haven't looked at the specs side by side yet, but wondering what you get for the price difference in price between the two. The K50 looks like it would throw noticeably better than k40, but curious if you feel that it sacrifices any spill or if it...

Things that require extra security will often have features meant to fluoresce under the less common lower wavelengths while not doing much of anything when irradiated with +400nm. Maybe see if some high value paper money or personal checks or paychecks have some of these fancy features. I...

Whoa, lm317 is worse than I thought!

Perhaps it is some sort of layer in an epitaxially grown semiconductor? I almost feel like I have seen that picture within the last 2 years. More likely, it is an ultrasound image from a pregnant millipede. It's cute!

I've got OEM FX-35 bixenon projectors, with the 2.5" clears from OEM Acura TSX. It's modded to a single cutoff shield for more blue. Stock, it has two cutoffs that are just inside and outside the focal curve of the lens, which results in combined orangy aberration with blue aberration, to make...

Arg got it first, djQuan got it more specifically. Also acceptable: car headlight, or even just car! The projector incorporates a 2.5" aspheric lens, and I used the clearest one I could find at the time, for a nice, sharp cutoff. Then defocused a smidge for a bit of flair.

It might help if I added this qualifier: Not ONLY a lens. Some background, this is an image of what the device projects when shined at a vertical wall. The picture is zoomed in to show the aberration because pretty. Here is another view with some objects that may give you an idea of the...

You're in the UK. You may have to pretend that the image is backwards ;-) *hint*

Those of you who own a device with this type of light will recognize it. I'm looking for, fairly generically, what device made this beautiful aberration. But more specifically than "A lens." And I made no attempt to mask what it is via filename, and you can see other pics that give it away in...

Might be a good business: emf-shielding buildings or particular rooms.

Explore Modeling - face of e.l.f. Cosmetics: Lin < voting!

You won't have those awkward questions with the brick if you hold it menacingly enough ;) Also, beam dump vs. brick, the DIY beam dump probably scatters less light.

looks like a sleeve that fits on the can of the diode. but what is the driver?! Very cool :-)

Heh, sometimes I get a bit long-winded! It's hard to know without doing experiments, I guess. Both designs have benefits, and it is hard to guess at which one would outperform the other. My main thought is that maybe not everybody has a benchtop vice. What methods of fairly easy assembly...

To lase, the "active ingredient" must be able to emit the same energy as the photon when bumped with that photon of the wavelength that is already present and resonating. I think another way to say this is that the band gap of the "active ingredient" in the gain medium at that temperature has...

But aren't they already assuming everyone is able to press-fit the module into their heatsinks? With flashlights, there are P60 hosts that accept p60 drop-ins. These are cool because you can swap out whatever drop-ins you want. However, they have pretty bad thermal performance, and you have...