What kind of light fixture uses a 19.7 volt 200 watt lamp?

Apparently, some people didn't learn seventh grade science because they posted a chart with a couple of glaring errors.

Clearly, you have no idea what you're looking at................

Voltage is pressure. So you are kind of asking why a tire rated for 40 PSI blew when you put 75 PSI in it. Thats why.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

Pool light. The pool has fiber optic lights and the halogen is the light source.

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2014 C250 21,XXX my new DD ** 2013 GLK 350 18,000 Wife's new DD**

- With out god, life is everything.
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Well i was looking at it more like a 200 psi tire and it ran fine with 20 psi but not 50 when it is rated for 200. I guessed that the voltage had something to do with it but was not sure how.

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Sent from an agnostic abacus

2014 C250 21,XXX my new DD ** 2013 GLK 350 18,000 Wife's new DD**

- With out god, life is everything.
- God is an ever receding pocket of scientific ignorance that's getting smaller and smaller as time moves on..." Neil DeGrasse Tyson
- You can pray for me, I'll think for you.
- When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours.

Think of the bulb like a rubber hose; voltage is pressure, current (amps) is the amount of water flow, and power (watts) is the amount of energy in the water flowing through the hose to turn a waterwheel (pressure x flow = power). The hose is designed to carry a certain amount of water flow at a certain pressue, if you increase the pressure a little, the flow will increase and the water will contain more energy; if you increase the pressure too much, the hose will burst. How much extra pressure you can get away with depends on the design and quality of the hose.

Gotcha- I've never run across one of those. I wonder why they chose 19.7 volts instead of 120 or even 12 as they are commonly available. I'm sure there is some reason, probably so you have to buy their proprietary lamp!

If you think for one minute, you'll probably realize exactly why they didn't use 120V. 12V may have required too much current to get the illumination they sought.

In this analogy, the bulb is the tire....

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On some nights I still believe that a car with the fuel gauge on empty can run about fifty more miles if you have the right music very loud on the radio. - HST

1983 300SD - 305000
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1994 GMC Jimmy - 203000

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It all originates from the 120/240v service so it's just a matter of what transformer you use. The difference from 12 to 19.7 volt is not that much and 12 volt is much more common. As I said, I'm sure there was a reason they made the lamp 19.7V, but I'm not familiar with the system or the use of that voltage for anything.

So I take it you were a knuckle draggin Machinist Mate?

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86 300SDL. 250,xxx on #14 Head. One eye always on temp gauge.. Cruising towards 300K

Nice analogy. I always used the pressure used(voltage) has to overcome the friction(resistance) and the by product was heat or light(current).

I get it from both sides in the power plant as well.

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86 300SDL. 250,xxx on #14 Head. One eye always on temp gauge.. Cruising towards 300K

Sorry, you failed the test.

The reason that you don't use 120V around a pool is to avoid killing someone if the worst scenario occurs. This has occurred in prior accidents when the system failed at one point and did not have a GFI.

I would have thought that you, of all people, would have known that.

Nope, just a plain old mechanical engineer.