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

learn more… | top users | synonyms

0
votes
2answers
58 views

TSOP382838 IR receiver keeps outputting signal even if no infrared light is present

This is a beginner question. This is my first time using an ir receiver. The one I have is a TSOP38238. I have setup a simple circuit that consists of a visible led and receiver. When I have no ...
0
votes
2answers
55 views

Adding a sensor to a traffic light circuit?

I am using the current circuit to time a basic traffic light that changes every twenty seconds: However, I've been trying to figure out a way to add a way to detect a car stopping at the light, so ...
1
vote
1answer
60 views

Narrowband LED performance compared to Laser for Spectroscopy

I am currently building my own Raman spectrometer and I am in the process of choosing a light source. I am deciding whether I should be using LEDs vs traditional laser modules. These are my ...
0
votes
1answer
68 views

LED and light bulb in series

I have this electrical system: a switch connected to a 120V 60Hz 21W light bulb. I wanted to add two outlets one for a LED, another one for something else like a laptop or a fan. I tried to plug in ...
2
votes
2answers
48 views

How many lumens does an incandescent halogen bulb provide?

I got my hands on an old slide projector (the kind that projects cel slides onto a wall). The light source, is a 24V, 150W incandescent halogen lamp. As a little pet project, I'm thinking of ...
1
vote
1answer
40 views

How to estimate solar panel output as a function of solar radiation

Apparently, according to EarthScience.SE, the measurement of how "bright" a given day is, is measured in units of kWh/m^2, known simply as "solar radiation". ...
4
votes
4answers
729 views

Can a photodiode distinguish between daylight and white/blue LED?

I am working with a photodiode that is supposed to detect very tiny amount of LED light(the light will be programmed by an attiny 85). Using different kind of lenses I succeeded amplifying the light ...
2
votes
1answer
133 views

Is the intensity of light shone onto a solar panel proportional to its power output?

Is there a linear relationship between the two? I ask because I'm investigating the effect of a different variable on the power output of a solar panel, and intensity is meant to be one of my control ...
6
votes
2answers
667 views

LED blinking with capacitor and schottky diode?

I saw one circuit which connected one 100uF capacitor and one schottky diode as mentioned in the below circuit diagram. It has a negative logic rectangular pulse at cathode of the LED, which is ...
0
votes
1answer
61 views

How to add lumens

I have n bulbs of luminosity k in fixture a. How many bulbs of luminosity l do I need in fixture b for the brightness of a to match the brightness of b? Specifically, I'm wondering how many standard ...
0
votes
2answers
31 views

Dipole antenna VS. coil for RF transmission or recieving

Correct me if I am wrong, but all RF light waves are created via a changing electric and magnetic field. But when looking at all kinds of radios and RF circuits, this light wave is always made with a ...
0
votes
1answer
48 views

light bulb socket which connection to use? [closed]

I am trying to install a light bulb in a socket with 4 connections: P N M1 GND I am wondering which ones to use for connecting a simple 220v light bulb? thanks.
4
votes
5answers
93 views

Nature of Electromagnetic Waves

We know that light is an electromagnetic wave. So is a radio frequency wave. From what I understand, the 50 Hz power frequency wave in our 230 V supply at home (60Hz and a lesser voltage in countries ...
-1
votes
1answer
46 views

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 ...
1
vote
0answers
49 views

Designing a high intensity flash attachment for airsoft rifle

Dear readers of this community, I've been looking into starting an electrical project and in my research I've often came across this community. Because none of the topics fully covered my question, I ...
4
votes
1answer
45 views

How does area and intensity relate to perceptive brigthness of a light source?

I want to design tail-lights for onboard use in vehicles (mostly bicycles), but I wonder how should I configure the system so as to get the best visual perception from a distance. Each lighting ...
0
votes
2answers
75 views

LEDs and External Quantum Efficiency (EQE), how to find Light Output Power with test results? How to find power?

I'll try explain everything as clearly as I can as it's slightly complicated. I really need help as I'm quite new to this kind of experiment and work so any help would be extremely appreciated. I did ...
1
vote
1answer
61 views

30x Incandescent light bulb in parallel ? + dimming

I'm trying to connect 30x small incandescent light bulb in parallel (1.5v / 300mA). But I'm having some issue designing the supply and dimming circuit. Does it just work like LED's for the ...
1
vote
1answer
86 views

Is it Possible to Produce Any Color Temperature?

I see it is possible to purchase many different color temperatures in light bulbs from 3500K (in the red spectrum) to 6500K (in blue spectrum) all the way to 10,000K and even 20,000K or higher. All ...
2
votes
3answers
138 views

Is there a simple way to diffuse the light of a “super bright” 5mm LED?

I want to put yellow leds inside the turning-signal cases used in motorcycles. The problem is: since the case is not deep enough, when I look from far I can only see the focused, pin shaped LED ...
2
votes
1answer
150 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 ...
9
votes
5answers
197 views

Visible light communication receiver

I am a student and I have to design a visible light communications project. The requirements are 20 cm distance between the receiver and transmitter, 20 kbps/s data rate and it must work in an already ...
1
vote
1answer
93 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 ...
1
vote
0answers
32 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 ...
1
vote
1answer
67 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 ...
0
votes
0answers
37 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 ...
1
vote
2answers
121 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 ...
0
votes
3answers
206 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 ...
1
vote
1answer
145 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 - ...
1
vote
1answer
140 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 ...
0
votes
1answer
27 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 ...
1
vote
1answer
147 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 ...
0
votes
0answers
87 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 ...
0
votes
1answer
137 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 ...
4
votes
2answers
399 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 ...
1
vote
1answer
35 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 ...
0
votes
1answer
60 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 ...
0
votes
2answers
131 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 ...
6
votes
2answers
173 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 ...
2
votes
2answers
418 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 ...
2
votes
3answers
257 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: ...
1
vote
2answers
124 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?
2
votes
4answers
98 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 ...
0
votes
3answers
155 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?
1
vote
1answer
81 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?
0
votes
0answers
56 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 ...
2
votes
4answers
318 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 ...
2
votes
4answers
4k 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 ...
0
votes
4answers
225 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 ...
0
votes
0answers
116 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 ...