need ideas - lighting

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need ideas - lighting

Postposted on Thu Mar 27, 2003 3:40 pm

i just had a brainstorm for a new mod and i need a little background info.

i did a cpl searches already, but i really dont know how to phrase what i want to get good results.

i want a light that can project a beam.
i have a cheapo comp usa case that im using to house my server. well it has a square cut hole on the front panel with a drawer type assembly attached to open and close it. i dont know what its function is supposed to be but i use it to pop off the front panel.

here is a rotton pic from the comp usa site here

you can make it out under the 3.5" bays

i already painted the exterior of the case bright florescent yellow and sealed it with some clear coat.
what i want in that hollow area behind is a light that projects a beam with minimal diffusion over a 20 foot span. color choice is not as important as effect.
if this is not economically feasable how about a prism effect?
Bizzaro
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Postposted on Thu Mar 27, 2003 5:03 pm

A beam?

Without dust or smoke in the air, you won't see anything in the air. You'll just see a dot where the beam is aiming.

Your best bet would probably be a cheap laser, preferably something that worked off of 5V. If not, you could build or buy a voltage regulator. LM317 at RadioShack.
Freon
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Postposted on Fri Mar 28, 2003 8:31 am

Freon wrote:A beam?

Without dust or smoke in the air, you won't see anything in the air. You'll just see a dot where the beam is aiming.

Your best bet would probably be a cheap laser, preferably something that worked off of 5V. If not, you could build or buy a voltage regulator. LM317 at RadioShack.


the beam is going to reflect off the target surface, and there is always a bit of smoke and dust in the air in the room it will be in so im hoping to get that sparkle effect.
any ideas where to shop for a low power laser? and if it was on for long periods of time, would i have to worry about the heat projected onto the target surface?
ill check radio shack, like you suggested, first off
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Postposted on Fri Mar 28, 2003 9:57 am

i found this
http://www.lasersale.com/catalog/display_products.asp?cat=59

but i think its overkill. these lasers demand some safety precaution, and considering my recreational use of said laser, im thinking its too dangerous.
still looking......
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Postposted on Fri Mar 28, 2003 11:11 am

Use any crappy laser pointer, you can dis-assemble them, grab the laser itself, and power it from +5V. Most have internal limiting already, but to be safe put a 1/4 watt resistor in series of 33-100 ohms. You can find red laser pointers at FYE, Radio Shack, and many other places.

Green ones are very cool, but expensive. The solid-state versions use a frequency doubler crystal to take infra-red and convert it to green at some loss of output power. They are also much more visible to the eye.

To get the sparkle effect requires a very intense laser which are unsafe at best, and usually not solid-state. If you check out DigiKey.com they sell some decent power solid-state lasers, but they will cost you dearly. I have a 50mW HeNe gas laser that produces a nice sparkle effect in a dusty room, but will give you blind spots rather quickly if you don't use protection for your eyes. It is bright enough to light clouds and bounce off of a street sign several miles away when the air conditions are just right.

Good luck!
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other options

Postposted on Fri Mar 28, 2003 11:46 am

i saw the HeNe's for sale. the cheapest is a red 1mW for $295. maybe lower pwrd ones are available, but i didnt find any yet

the size would prohibit me from installing it inside the case and i wouldnt trust my $295.00 investment, or more accurately, i wouldnt trust myself with my $295.00 investment if i planned on dissassembling it.

the other concern is that at that intensity, you have to be pretty carefull, and the enviorenment i plan to show this off in would not be safety concerned.

i saw plenty of superbright led's and laser pointers for sale, some as cheap as 6 bucks. i thought about getting 4 of them, pulling out the lasers like you said, and figuring out a way to power them ( thank you for your advice, that problem is now solved. )


my concerns here would be a lack of power and range.
im thinking out loud here, so pls offer your thoughts or advice.
what if, instead of relying on a diffusion plate located 15-20 ft away, i diffused them much closer. say some sort of transparent assembly located an inch or so away from the source and fastened to the exterior of the case. im thinking i could get at least the prism effect i mentioned by this process? maybe a cheap faceted crystal or something?

edit: btw- what the hell are you doing with a 50mW!!!!?
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