Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [lamp]

137 questions
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2 answers

Lighting metal halide lamp

I want to use some metal halide lamps (5-7*150W) to get some decent lighting in my room. Unfortunately, inductors for these lamps have weight about 2kg each. I cannot accept 10kg of metal hanging near the ceiling :-) So I must go with electronic…
BarsMonster
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1 answer

How does 3-way lamp remember its last setting?

The Wikipedia article on 3-way lamps says that the rotary or pull-chain switch mechanically goes through all the states, if I understand correctly. However, I noticed that my floor lamp still cycles through the 3 brightness levels when I flick a…
mk12
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vote
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Bypass circuit for 6.6A AC lamps

I'm developing a circuit project to bypass the current of several lamps in series in case one of them burns out. Initially, my idea was to put a resistor in parallel with the bulb, so that when the bulb burned out, the current would pass through…
Rafael Gabriel
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What happens if I power a 12 V LED lamp at twice its voltage with a 24 V power supply?

If I have an LED lamp which is specified as, say, 350 mA at 12 V DC, what would happen if I fed it directly from a 48 V DC constant-current power supply capable of providing up to 350 mA? I understand increasing the voltage on an LED lamp typically…
Brandon Kellett
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10-Bulb Edison Chandelier

I'd like to make this chandelier: But before I embark on this quest I've few questions. Cleverly titled "edison chandelier", this thing has 10 incandescent bulbs so energy consumption will be over the board with approx: 10*60w=600w. More than half…
user8539
0
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3 answers

Identifying the pins of an AC lamp

I have an AC indicator lamp which I have to add to a design and and here is the only information. As you see the two terminals are tied on one side and the other two pins has no continuity with any other pins. I cannot verify the correct phase and…
cm64
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Attempting to make a NES Zapper Lamp and need wiring help

So I have a Nintendo Zapper gun that broke and I want to turn it into a Desk lamp. But I want to use the Trigger as the On/Off switch. Can somebody please help me and point me in the right direction on how I would wire that? Anybody familiar with…
Jedi Dean
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How do I choose a lamp?

I've got a project I'm working on, which is essentially a set of MCU-controlled relays. I'd like to set up a test harness for the system, using something visual on the outputs. I was thinking some small, low-power light bulbs. I've got 28V AC…
Mark
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How insulated is 14-gauge wire?

Is insulation standard or does it vary? If I have a wire with 2 14-gauge wires inside a second plastic sheath will it handle higher voltage than the technical rating of 110V? I want to use it in a 220V country. Please note that this is just a set of…
Elizabeth
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Rated voltage vs rated power on lamp holder

I bought a string of lights from America (110V, 25W per socket, 50 sockets (1250W total) to use in South Africa (power supply is 220/230V 50Hz). I thought I could just use a converter (220V to 110V) and 25W incandescent bulbs. But now I wonder if I…
Elizabeth
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green NE-2 like bulbs?

About 25 years ago I found a small light strip at a surplus shop which appeared to contain NE-2 neon bulbs, but they light green. The glass is clear so it is not a fluorescence effect or something. I have never seen anything like them anywhere else.…
user56384
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1 answer

Zener diode identification

I need to replace the zener diode. Will the model marked in the table in the picture be correct? The marking method indicates that the diode manufacturer is: "DIODES INCORPORATED". I do not understand why the SMAJ15 diode requires 15V, while this…
008
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