Questions tagged [lamp]

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48
votes
6answers
60k views

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 ...
12
votes
3answers
26k views

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 ...
8
votes
4answers
8k views

Why a neon lamp indicator on power strip switch flickers 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 start to ...
6
votes
3answers
1k views

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,...
6
votes
2answers
255 views

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 ...
4
votes
11answers
2k views

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 ...
4
votes
6answers
2k views

Why plug is polarized in the US? What are the benefits?

I could not get a good hold of it, I searched online quite a bit. This must have to do with safety but then non-polarized switches are used through out the world with no issues are risks, so my ...
4
votes
1answer
5k views

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 ...
3
votes
4answers
3k views

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 ...
3
votes
2answers
1k views

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 ...
2
votes
1answer
1k views

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 ...
2
votes
2answers
205 views

Why would an incandescent bulb produce a bright flash when burning out?

A typical way of an incandescent bulb to burn out is with a bright blueish flash and often an audible sound and (very rarely) an explosion of the bulb glass. Wikipedia says the following: Since a ...
2
votes
3answers
146 views

Does lifetime of tungsten incandescent lamp shorten by every turning on, directly connecting to electric grid, and how much?

Does lifetime of tungsten incandescent lamp shorten by every turning on, directly connecting to electric grid, ie not using special device to turn it on smoothly, and how much? It was said to us in ...
2
votes
3answers
710 views

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 ...
2
votes
1answer
12k views

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 ...
2
votes
1answer
199 views

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 ...
2
votes
2answers
6k views

Why is a common LED failure mode to flicker astably or oscillate? [closed]

There are many cases of LED lights failing by beginning to flicker intermittently. I am not talking about the intentional duty-cycle modulation utilized in many driver circuits. I am referring to ...
2
votes
1answer
363 views

Driving compact UV lamp with DC

I'm 'testing the water' if you will on driving a Panasonic TUV PL-S 5W UV lamp with a low-voltage (12 ~ 24 V) DC supply. The lamp is rated at 34 V, 0.18 A. Since I have a DC source, magnetic ...
2
votes
2answers
374 views

high voltage igniter for carbon arc lamp

I know how a carbon arc lamp works, but knowing that an arc lamp of inert gas, ignited by a discharge of high voltage that ionizes the gas inside, I wonder if it would be possible to cause the ...
2
votes
1answer
1k views

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 of this ...
2
votes
0answers
66 views

What is the off-white powdery material found at the base of GU5.3 light bulbs?

I've noticed most GU5.3 light bulbs, both halogen and LED, contain a granular material at the base. There seems to be considerable variation in how much of this powder is present, even within the ...
1
vote
3answers
1k views

filament led bulb inrush current

I'm tring to choose a relay for my circuit which has a Filament LED bulb as load. The bulb is 230VAC / 60W 6W. The nominal current should be about 0.03A which is not an issue for a regular relay. The ...
1
vote
2answers
144 views

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 ...
1
vote
1answer
121 views

Question about a point made in Art of Electronics

In the Art of Electronics (Second edition), Section 2.02 (Transistor Switch), the book gives a circuit diagram with a bulb rated 10V, 0.1 A, connected to the collector of a NPN transistor. The other ...
1
vote
1answer
112 views

Will this work and what transistor do I use?

I posted this question in the Meta Stack Exchange but David Tweed said that the idea was flawed so any alternative circuit suggestion would be appreciated. I have this Ikea lamp. It runs off 5V usb ...
1
vote
2answers
5k views

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 ...
1
vote
2answers
278 views

Arduino Control 12V Lamp with Car Battery

I'm working on a small project to control a lamp with car battery and I found this circuit on Internet. Now my car batter delivers 5 amperes and I would adapt this circuit to my needs. Is it possible? ...
1
vote
1answer
391 views

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 ...
1
vote
1answer
61 views

Low-power halogen lamp dimmer

I want to connect a set of low power halogen lamps to a dimmer. This would be used to illuminate plants who are then monitored using a hyperspectral camera. I was wondering whether any spurious ...
1
vote
1answer
2k views

How to test a pond filter UV lamp and ballast?

I bought a new UV lamp for a pond filter but I don't see any light from the inspection lens in the lamp holder. I checked the the connection in the socket and I see 240v. Does that mean the ballast ...
1
vote
2answers
3k views

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 ...
1
vote
1answer
506 views

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. ...
1
vote
1answer
2k views

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? ...
1
vote
1answer
418 views

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 ...
1
vote
0answers
106 views

Theory of Operation for Arc Lamp

I am attempting to power an arc lamp (which I have) using a programmable power supply (which I have yet to source.) Though the lamp is rated at 1000w (37v at 27A) I would like to power it at about ...
1
vote
2answers
144 views

Making a 100 LED Lamp

So I'm still very new to electronics but I would like to make a 100 LED Lamp for fun. I got my hands on a few 18650 batteries yesterday so I decided to do this project. I thought it through but I am ...
1
vote
2answers
2k views

iPhone screen pin layout

I have an old iPhone of which I want to reuse the LCD display. The thing is, I don't want to use it as an actual display but rather make a fancy lamp out of it. The question I have is how I can figure ...
1
vote
3answers
22k views

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 ...
0
votes
4answers
1k views

How do I connect light bulbs to an alternator on a bike?

Some friends and I are working on a school project and need a bit of help. The basic premise is that we’re using a bicycle (which is kept stationary) to spin an alternator and power some lightbulbs. ...
0
votes
2answers
922 views

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 ...
0
votes
3answers
92 views

What is this small circuit board used for in a 12v light?

Repairing a home-made disco light that was used in a nightclub during the 80's/90's and it consisted of 16 12v 50w lamps arranged on 8 legs. I have discovered a small circuit board within each lamp ...
0
votes
2answers
20k views

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 ...
0
votes
2answers
55 views

Wiring 1 lamp and 1 fan to 2 switches instead of 1

There's this setup, where I have one lamp and one fan, both are connected to one switch. I would like to add another switch to control them independently. Here's a rough schematic of what I found ...
0
votes
2answers
80 views

Replace lamp in old amplifier

I am trying to replace a fried lamp in my very old amplifier (a Dual CV 1280 Integrated). As I essentially only use the mode that is indicated by the fried lamp, I thought I could just switch it with ...
0
votes
2answers
1k views

Two or more Diac Triac dimmers in parallel

I wanted to know whether connecting two or more simple diac-triac ac lamp dimmers in parallel with the same load cause any problems? I do not want to connect them in series, just parallel will be ...
0
votes
1answer
89 views

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 ...
0
votes
2answers
195 views

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 ...
0
votes
5answers
88 views

LED lamp - connecting LEDs in parallel

I have a question about LED lamp: Quantum Board It has 16 strings of LEDs connected in parallel. Each string consist of 18 LEDs connected in series. It's supplied with constant current source (with ...
0
votes
2answers
57 views

How do series connected lamp dimmers/electronic switches work?

How does a series connected electronic LED lamp switch operate when it has switched the lamp off and there is no voltage reference. And how does it work when the lamp is switched on and the voltage ...
0
votes
1answer
417 views

Help me understand and fix this dimmer circuit

I have a table lamp which has a busted dimmer control. When I bought it the dimmer used to kinda work but then after a few days it worked only when the rotary knob was turned all the way high. After a ...