Questions tagged [lamp]
The lamp tag has no usage guidance.
143 questions
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Smooth and no-flickering dimmable light source
My goal is to record a video with a varying intensity light source.
No flickering at any frame rate (frame rate 30 60 120 240) while watching frame by frame, not human eye.
Smooth dim level
Any type ...
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Ceiling LED light emits very dim light when switch is off! [closed]
I have overhead ceiling LED light fixtures.
When I turn on Main Switch of the house, I see the LED starts emitting very dim light ( have to look for a 3-4 second to perceive) even when LED's switch ...
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1
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536
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Can a lamp cause a fire if exposed to steam? [closed]
I have this lamp (IP20) in my bathroom, and was wondering what the hazards are.
http://www.nordlux.com/en-US/FIND_YOUR_PRODUCT/Produktvisning/Chamber_-_fitting_8w-27226101.aspx
Will it just stop ...
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Wall mount Rotary Dimmer installed on lamp cord?
Could I do something like the diagram below, or is this a technically bad idea?
I like the feel of this rotary dimmer and was wondering if it was safe to install it on the cord between the outlet and ...
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2
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Does a lamp need a fuse? [closed]
I have a floor lamp in which I have installed 2 LIFX Color 1000 A19 Wi-Fi LED Smart Bulbs (http://www.lifx.com/products/color-1000)
The lamp is designed to have 2 bulbs and has a two position dimmer ...
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5
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Why does a neon lamp indicator on a power strip switch flicker in the dark?
Neon lamp indicators embedded in power strip switches indicate whether the switch is ON or OFF.
When the neon lamp is ON in a dark environment (lights of the room are off), the lamp begins flickering ...
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1
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2k
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Dimensioning smoothing capacitor for China DIY LED lamp
My first question here so bare with me if I'm a bit "off" or so regarding the level of knowledge etc. My purpose is to try to learn things. So I started off by buying some LED lamp DIY kits ...
- 141
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Why does my new 220V AC to 12V DC transformer only allow one Halogen light to work? [closed]
I'm trying to revive an old Ikea "Trettio" lighting set. The set is made up of a 220V to 12V transformer and 5 Halogen lamps connected to it in parallel.
Remembering that the original transformer was ...
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5k
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Alternator Charging Light
Very Stale EE here (30 years maybe?), so be gentle ;) Now I own a horse farm and do lots of equipment maintenance (and other things). Replacing an engine in a mower with a kit from another ...
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Powering flash light directly from battery
I have Bowens 500R studio lamp (http://www.bowensdirect.com/gemini500r)
It can be powered from a 12V battery (there is a 15 din input at the back of the unit) through a Travel Pack (http://www....
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Why does compact fluorescent lamp (CFL) save more energy?
I read information about fluorescent lamp and compact fluorescent lamp (CFL) but I still don't understand why CFL saves energy and produce the same amount of light?
Maybe the electronic ballast ...
- 3,854
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Raspberry Pi controlled lamp using a relay & mains procedure
I am trying to turn on and off a lamp I have at home using a relay controlled by my Raspberry Pi. Here are the exact parts I will be using:
Raspberry Pi B+
My lamp:
My relays:
Potential outlets I ...
- 111
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1
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2k
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Puzzle: Controlling two lamps with one SPST switch (AC)
This is the text of the problem:
Draw a circuit with two lamps & one SPST switch.
The lamps must be in opposite states.
New parts are disallowed to add to the circuit, but there is no ...
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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 ...
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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) ...
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How to calculate the voltage across the load of this circuit
I have this rechargeable night lamp which I built it using the circuit which I got it over the internet.There is no problem with the night lamp but I just wanted study the working of the circuit but I ...
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Difference between dichroic, LED and halogenated lamps
I think that this isn't the best place to ask this, but I couldn't find my answer to this and I couldn't find any other stack exchange site related to this.
I wanted to know the differences between ...
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Will repeatedly turning a light bulb on and off damage it?
I have been hearing a common saying that if one keeps switching the lights on and off you will probably damage the light bulb itself, since every time you close the switch there would be a sudden rush ...
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3
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Using A Relay To Control A Lamp
I'm experimenting with capacitive sensors acting as switches and want to actually give my circuits some practicality. I've been researching how to use relays with microcontrollers (in my case, an ...
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Auto-Transformer: how to understand the following diagram?
I have a question about the CW Auto-Transfomer that I will be using.
The wiring diagram is above. As you can see, the equitment takes 277/240/208/120V as input. But on its specification sheets, it ...
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How to add a 5V USB output to the base of a mass-produced custom table lamp to add phone and tablet charging capabilities
I am a lighting designer that just released my first table/desk lamp design. I would like to add a USB charging port to the base, so people can light their desk and charge their phone or tablet.
What ...
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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 ...
user56384
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Using 6x58W fluorescent lamps instead of 6x55W, what could possibly go wrong? [closed]
I'm planning to buy a fluorescent photography lighting head, but the manufacturer specified it uses 6x55W lamps, but I want to use Philips Graphica 58W lamps. 3 watts more per lamp, doesn't look like ...
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How to make LED lamp (220V 50Hz input) circuit by using 1 watt LEDs? [closed]
I think to make LED lamp circuit by using 1 watt LEDs (300mA and 3.6V).
How to make circuit. But I can not use transformer.Because size and cost of transformer is high).
Input single phase, 220V,50Hz ...
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533
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How many of these UV lamps do I need for PCB fab?
I want to build a PCB UV exposure unit. It will be in a wooden box, it will have lamps and a glass above them. Basic design.
For the lamp drivers I will use the circuit from the neon lamps at home. ...
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Is a 250V lamp compatible with both 120VAC and 220VAC?
Is a 250V and 660W lamp compatible with both:
120VAC at 60Hz, and
220VAC at 50Hz?
And why? Also, does the frequency of the mains have any bearing on the lamp?
In North America I was very ...
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Discrete lamp dimmer circuit: how to choose component values?
As you can see, the VAR is 500K Ohms, the capacitor is 100nF. (AC voltage = 220V, freq = 50Hz)
I already built this circuit and it works perfectly. Can anyone show me how those values were chosen? ...
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Uniformly illuminate an array of LEDs: how to get the most homogeneous output?
Please note: this question refers to the electrical engineering part
of the design, optical configuration is not request (advices are
however welcome)
I'm trying to design a LEDs lamp with an ...
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Touch Lamp Control Parts
I'd like to build a lamp for my girlfriend's birthday. The lamp would change colours if she touches the lamp base.
My idea is to use Arduino Nano as the "intelligence" and a line of sensors under the ...
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How to make transistor fail protection for light bulb
In the circuit below I choose an optimal current for the lamp set to 4A (the lamp specs are 12V/5A).
I need to make a safety circuit for the lamp in case transistor Q2 fails.
I add a fuse in the ...
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3
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160
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Looking for a medium power optocoupler
I have a project where I will control a 3 or 6 watt UV lamp DC with a microcontroller.
I want to power my lamps with a AC/DC circuit and switch them on and off with a optocoupler, mainly because ...
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DALI error detection command
I need a help from someone who knows DALI standard well and has experience on it and knows DALI control gears' structure.
I make a DALI related application and aim to detect if the connected lamp is ...
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USB Lamp, controlled by linux driver
I want to build a simple USB lamp (maybe colored LED lamp) which will be controlled by PC. So, actually, i want to get practice in linux kernel modules development, but i need to get appropriate ...
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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 ...
user8539
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6
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Does turning a lighbulb on and off repeatedly use more energy than just leaving it on for hours?
Let's say I have a 60W bulb in a lamp in my bedroom. If I kept the lamp on for 2 hours straight but the next day, I switched it on and off 10 times in intervals of 5 minutes. Which scenario would use ...
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Calculating parallel resistance of a rated bulb
I have a bulb rated 110 V, 60 W and is in series with another bulb which is 110 V, 110 W. It's being powered with a 220 V source. Now, what would be the resistance of the resistor to be added in ...
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Switch lamp with two serial switches
I have a lamp, with the usual built-in switch, which is powered via a wall-mounted socket. The socket is switched itself with a normal wall switch. So, both switches operate in series, the lamp lights ...
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How could I replace the lamp on a regular projector for a LED lamp?
I have a 1080p projector and I want to change the regular 230w lamp for a LED lamp that uses less energy and lasts longer.
How complex would this be? LED projectors with these specs are ridicously ...
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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 ...
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Driving 12V halogen lamps (downlights)
12V halogen lamps, do they need any special driving?
I have seen on some transformers that they output Half-wave rectification to the 12V halogen lamps. Is this how they should be driven or can ...
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How does a dual-wattage (automotive) bulb work?
I have a motorcycle headlamp bulb on my desk here. I notice the bulb has a rating of "60/55W" and has three connectors instead of the usual two.
Evidently these correspond to the high/low beam ...
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What's the problem in designing a bright enough LED lamp?
So far the most powerful household LED lamp I've seen had consumption of 2.1 Watts and gave light equivalent to maybe 15-25 Watts incandescent lamp. That's maybe good for illuminating a Christmas tree,...
- 12.5k
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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 ...
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