Low Voltage, Hi Output Tank Inspection Light

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cool_hardware52

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I've been in the Bicycle light business for 20+ years. Over that time I have unfortunately collected some "orphaned" components.

Some times a design changes and obsoletes other components, or one required component is discontinued and that forces other changes. Some times the purchasing department blows the forecast for a given item.

I happen to find myself with a fairly large quantity of very bright 8 watt miniature gas filled xenon bulbs, and AC-DC wall adapters capable of directly powering these bulbs.

The lamps are left over from a discontinued bike light, and the AC-DC "chargers" are just ideal for a battery that never quite made it out of development.

I have in the past soldered the leads of the AC Adapter directly on to one of these bulbs, and used it for a tank inspection lamp.

Works great. Very Bright. 8 watts is a great deal of light. Nice and white. By comparison "rope lights" are usually about 5 watts / ft. or less and offer a much lower color temperature.

These are small and easy to get into the tank, the wire lead is nice and long (even for big bank bottles)

Well I finally got around to modifying a mold I had to make a "Socket" for these bi pin based lamps. Now it's possible to simply plug the lamps in the end of the wire lead. Insulated, and the bulbs are easily replaced in the field. The lamps are made using a fairly thick silica glass tube, and are pretty robust even when just the bare bulb is used on end of the lead.

I'm thinking of offering these for sale. Does $18 seem reasonable? (with one bulb, replacement bulbs are $4) You'd be hard pressed to buy the parts for that.

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Tobin
 
I made the same thing with an old auto tail light bulb and a 9-volt transformer from an old answering machine about 10 years ago. I taped the wires to an aluminum rod that allows movement of the light. Sounds like a great idea. I'm sure yours is much brighter and better than mine!
 
Sweet!
I made my first light similar to that back in the early '70s, though I used stiffer wire so it could be bent / positioned right next to a location requiring extra / closer eyeballing.
My bulbs were probably only around a watt though, your's is stronger than the lamp next to my bed!

What are the specs on your wall wart? I have need of some 12vdc & 12vac right now & an extra 13.5vddc or 2 wouldn't hurt.
 
What is the expected life of the bulb?

When you start to sell them I'll take one with a spare bulb.
 
I'd take one too, with a spare bulb. The HV stick at the shop only half lites at this point.
 
What is the expected life of the bulb?

When you start to sell them I'll take one with a spare bulb.

The mean bulb life is 100 hours. However it is useful to know that all incandescent lamp failure can be described as "unpredictable" and "catastrophic"

Typical mean life is the time it take 1/2 of a sample of lamps to fail, i.e. if you take 100 lamps and turn them all on the "typical mean life" is the time required for 50 lamps to fail.

One can expect a "bell shaped" distribution with some few failing in fairly short time, and some few lasting maybe 2x the typical mean time. Most will fail close to the mean.

When we used these lamps in bike light applications the results were good, with few early failures.

Tobin
 
Tobin....put me down for a unit/spare bulb.
 
Yeah I will take one with an extra blub there is lots of uses for something like this.
 

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