Light is a tag about anything generates photons in the visible spectrum

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48 views

How can a remote-controlled (wall) light switch operate without a power source?

A few days ago, i bought this remote-conrolled light switch. When installing it, i wondered why i had only two lines to connect (the one going to AC power and the one to the lamp); i thought i needed ...
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0answers
22 views

3 way dimmer installation

I'm installing a three way dimmer on a 3 switches line for a light. In the dimmer notes the installation is done by replacing the three way switch on the load side. Can I replace the one at the line ...
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1answer
38 views

Is Deuterium arc lamp a AC or DC light source?

I have created a prototype photo-detector circuit to use in spectroscopy. The micro-controller code take 120 A/D readings and then returns average. I have noticed that when I use visible light ...
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47 views

Help with a finished door light delay circuit acting weird

I made this light delay for my car, but it seems to be working "backwards". Q1 is actually an IRFR024n. What is supposed to happen is when DRP isn't grounded, lights are off (door closed). Door opens ...
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29 views

Check if mouse led is on or off via script when the mouse touches on the table

Is there any way to check if there's a object infront of the sensor of the mouse? What I want to do it that, I have mouse mouse facing a flashlight.. when I turn on the flash light, the red led ...
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2answers
62 views

Turn a METAL HALIDE BULB On/Off in 1 minute Intervals?

OK, let me 1st give you some background information. I need to generate 40,000 lux of light in an indoor environment (in a area of around 5 feet by 3 feet) and I need the ability to turn the light ...
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3answers
115 views

How to turn a switch on/off repeatedly in 1 minute intervals?

I have a light bulb plugged into an outlet and I need to be able to turn it on and off again and again in 1 minute intervals for a period of 10 hours per day (a total of around 600 on/off events per ...
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1answer
121 views

How to Generate Light in the 10,000K Spectrum?

I need to generate a lot of light with the same spectrum as the sun - 10,000 Kelvin (10000K). I have searched around for hours, however all full spectrum lights available are either 5500K or 6500K - ...
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1answer
68 views

How to Convert 20,000 Lumens to Lux?

I need to generate 20,000 lux of light in an indoor environment. I am having trouble converting the lumens to lux using online converters ( I know there are many such converters but the questions they ...
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1answer
20 views

How to turn on gauge lights from multiple sources

I have limited experience with relays, diodes, ect. so I need a little help. I'm currently building a rock crawler (off-road buggy) from ground up and I'm into the electrical and need some ...
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1answer
47 views

Chaining Multiple Bulb Socket Splitters Together?

I need to generate 20,000+ lux of light in a small indoor room. This is equivalent to around  30-50, 13 watt lightbulbs (each lightbulb is equivalent to 60 watt standard bulb) which produce around 800 ...
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82 views

What are the different elements on this circuit board?

Can you identify the parts on this thing? I don't understand how it is turning on when I put my finger on it. And besides the LED's, what are the other elements on the board lighting up? Light up ...
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1answer
79 views

PWM or Phase Control Dimming?

I want to dim a lamp around 70W or more using arduino. I have found two ways for doing that. The first one is to make a circuit that "cuts" the sine wave and produce the dimming effect (link). The ...
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2answers
312 views

LED-lighting problem [closed]

I'm trying to explain some LED-lighting phenomena, that we (me and my family) have observed, while changing light bulbs into LEDs. I've had some courses in semiconductor physics, and I've had a basic ...
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1answer
34 views

Reading USB Relay Specifications

Good morning, I am trying to work on some home improvement DIY projects and trying to control light from an RPi / Arduino using USB connection. I've found two possible products, that I think might ...
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1answer
57 views

Why did the light that I tried to turn on flicker green? [closed]

I was just turning on a light in my house (just a normal ceiling light, I think it is the round bulb kind, not the spiral bulb) and it flashed green and went out. It will not turn on anymore. This ...
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2answers
107 views

How to create this opamp circuit for mind machine

I'm trying to create a circuit to blink lights at the precise frequency for a mind machine. The lights need to be in sync with audio. Audio channel 1 300 hz Audio channel 2 310 hz The led needs to ...
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2answers
154 views

Turn a mains light on slowly

I've been looking at creating a simple circuit to slowly turn a halogen daylight bulb on over about 30 minutes as soon as power is supplied to simulate dawn. I've got a 240VAC 42W halogen bulb that ...
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2answers
308 views

Is this 12 volt LED circuit correct?

I found this "Plant Grow LED light" circuit on the Internet and I wanted to know if: (Please don't feel pressured to answer all my questions. You can just answer a few only if you like.) this is ...
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3answers
162 views

Do standard white LEDs produce a full spectrum of light?

At places like Radioshack, small (and sometimes large) LEDs are available that are labeled to be "white". This is a link to a Radioshack page for such an LED: ...
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2answers
72 views

Trying to decide how large of a battery I will need to power light bulb.

I am trying to power a 3 Watt light-bulb. I would like to calculate how long that light would run on a triple A battery versus a AA battery. How do I do that?
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4answers
88 views

How can I sense if a cane is being held upright or fallen down?

I am trying to make a little wireless-connected gizmo to attach to my grandfather's walking cane. The idea is that when it senses the cane has fallen down, it would alert/call one of us so that we can ...
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3answers
114 views

Lumen difference between CFL and LED

How much watt I need for LED bulb to get the same amount of light produced by 32 Watt CFL bulb? So, comparing lumen is the right way to find out the difference between these two light source?
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1answer
73 views

Output of Compact Fluorescent light (CFB)

I have few unworking Compact Fluorescent Lights and i was wondering what is the output of the circuit?
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55 views

Light powered by rocking kinetic device

I want to know if i can power a lower power light by simply rocking it. The light only needs to be on while its moving so should only require a small amount of power. I have included a picture that ...
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4answers
286 views

Which type of LEDs is a good source of light and can replace the sun

There is often no sun were I live so I need some advice for building a LED matrix that can replace the sun light and possibly avoid bad wavelength. UV produces vitamin D but upon reading ...
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3answers
2k views

LED bulb still emits light when turned off

I have recently purchased an IKEA LED bulb with G9 fittings, to replace a halogen one. This one. The bulb is installed in a lamp with 3 other halogen G9s in a 3 + 1 configuration with a 3-state ...
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4answers
187 views

Flashing leds from bicycle tail light [closed]

I'm not sure if this is the right place but I'm a bit puzzled by this (cheap chinese) bicycle tile light. I opened it up, but I don't seem to get it working again. It has three components: the ...
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0answers
91 views

What AWG wire should I use to connect RGB Signal Amps to LED Strip?

I am wiring in some 5050 RGB LED strip lights in my basement. There is a small utility room adjoining and I'm keen to keep the transformers and signal amplifiers in there in order that they can be ...
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26 views

plane electromagnetic waves

In free space with no charge, both the curl and divergence of electric field is zero. Plane electromagnetic field exists in such region. Besides plane electromagnetic fields, does any other solution ...
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1answer
59 views

How do I tell if a lightbulb is LED?

I have this bulb, that I didn't buy myself, and I don't have the packaging, nor do I know the price or anything. The writing says: ...
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3answers
196 views

Bike light blink speed adjustment

I am trying to construct a circuit to control an LED in a bike light kind of circuit. This circuit must be designed so that a button press can change the current setting of the light. So for instance ...
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1answer
88 views

Sequential Taillight Modification

I am interested in almost duplicating the functionality of the new Mustangs. When the rear tail lights are activated (there are 3 in a row on each side), I'd like the first one, then the second one, ...
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1answer
64 views

How light strike works?

I am new here and I don't know if I have chosen right stackexchange but anyway. I am making a little toy, just for educational purpose. I would like to understand how light strike works. It is a gun ...
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2answers
3k views

Do “blown” fluorescent lights still use electricity?

When a fluorescent light fixture goes out, it often flickers and then after a while stops shining altogether. When this happens and when it finally dies is the circuit broken and does it still use ...
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67 views

Light whose brightness varies with position

As a disclaimer, this is a complete beginner question as I know absolutely nothing about this field. I'd like to have an LED whose brightness is a function of its position in a room. For example, if ...
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0answers
82 views

Simple Circuit To Light Up OLED

I'm a ICT student and need to make a circuit to light up an OLED. we have developed an OLED but have some trouble with the power supply. We need to have an arduino so we can send an PWM-signal to the ...
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5answers
5k views

Can I turn Radio waves into light?

Wikipedia says that the frequency of light is 300 THz. I've made a radio waves transmitter that transmits about 100 MHz. If I increase the frequency of the transmitter to 300 THz, will the antenna ...
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0answers
40 views

Light sensitive resistor

I have a CdSe light sensitive resistor which goes from 0.1k to 30k light->dark . It works fine outside the circuit. When I pass +/- 1V 400Hz AC across it, it seems to always have a low resistance. Is ...
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3answers
118 views

Magnetic reed switch current ratings

I wish to use some 12 V, 5 W xenon light bulbs under separate shelves of a cabinet. I'd like them to power-on using a magnetic reed switch attached to the cabinet door. The magnetic reed switch I ...
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3answers
468 views

How do Wi-Fi controlled light switches feed themselves?

There are smart light switches in the market that are Wi-Fi controlled like Plumlife (formerly ube) and Belkin WeMo. I wonder how they control the electricity that they operate on. When I unplug my ...
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1answer
220 views

Adding a switch to an existing light

I've read about 3-way and 4-way switches but I don't understand something. I am aiming to create a bluetooth controlled home network. One of the modules would include a light switch. How would I go ...
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2answers
176 views

Run 12v Incandescent Bulbs off Fluorescent Ballast

Can I use a 120v AC to 12v AC electronic transformer to power 12v bulbs? I have a 150 watt transformer that I tried connecting to a single 10w incandescent bulb, but the bulb just flickers at a low ...
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3answers
89 views

Lumens vs Watts

What of this words define the intensity of the light of a bulb? Lumens or watts? I don't know if I am right. Lumens means intensity of the light and watts the consumption of the bulb
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1answer
57 views

how to turn backlight on for BC1202A LCD

Hopefully this question isn't too novicelike: I have an LCD (BC1202A) that I want to drive from a parallax propeller board. Spec data:link1 and link2 After hours of mucking around (mis-wiring, ...
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2answers
710 views

Two relays for DRL on a car

I am trying to make a circuit for my newly installed DRL (Day running lights), what I am trying to do is have the DRL run all the time, turn off when using high beam, dimmed when headlights are on. I ...
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4answers
369 views

Which circuit to use to automatically turn off the backlight of a GLCD after 30s?

Have you ever seen smart phones automatically turn their screens off after a short time to save the power? I want to do it on the back light of my GLCD (ks108sed). Descriptions: Back light will ...
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4answers
649 views

Cool White LED bulbs: Are they “full-spectrum”?

I don't have much knowledge on LED lights and find the technology quite fascinating (yes, I know, it is not that knew!) I have read that in order to create "white" light, LEDs actually need to emit ...
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76 views

WeMo Wireless Light Switch US convert to be used in UK?

I am in love with this thing and just cannot believe that it runs 120V 15A. Step down transformer would be too big since this thing should fit into the wall. http://www.belkin.com/us/p/P-F7C030/ ...
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1answer
73 views

How to make a dimmer for a 11W CFL?

I have a desk lamp, that uses 11W/827 CFLs (current one is an Osram Dulux S) The lamp uses a power supply ("Type BL1"), but it seems the transformer acts more like an AC/AC power converter, as it ...