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

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24 views

COB LED on Aluminum tubes as heat sink

Thanks in advance for any contribution to my project, I'm afraid I'm pretty illiterate in terms of physics, heat dissipation, etc. I want to build a light with COB leds mounted on aluminum tubes, I ...
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0answers
40 views

Turn on/off a led through headphones jack

I have an iPhone project , I need to turn on and off a led powered with a battery using iPhone via 3.5 mm jack. I need to do that in a frequency between 80-300 hZ, I can figure the frequency part with ...
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0answers
20 views

Equalization & Ringing for Square Wave Signal using VLC

I am currently working on a VLC project to build a VLC receiver. I attached a schematic of the circuit I have designed. The circuit on the left is the transmitter sending a square signal at 1 MHz ...
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2answers
44 views

How to use Lightsensor relay with 3v output

I want to find solution for one small circuit with Light sensor. I need one small light sensor to drive 3v output. The power of all the circuit must be 5v and when the light sensor is off (no ...
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2answers
78 views

Does air flowing over a bulb affect the amount of lumens produced? [closed]

If a bulb is cooled by air flowing over it, would that change the way light is emitted? I see contradicting evidence that air cooling bulbs changes how much light is emitted because the cooler air ...
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4answers
399 views

Flash a light in a specific pattern

It is quite easy to flash a light in say, 0.5 seconds on, 0.5 seconds off. But what if I wanted to flash it say 0.5 on, 0.5 off, 1.0 on, 0.5 off? Are there any IC's that would allow that?
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2answers
65 views

What kind of micro bulb is this? [closed]

I am doing a clone of my Honda's dashboard circuit. Everything is fine except I cannot find the tiny backlight bulbs (see photo) that are used for the dashboard button illumination. Are they standard ...
0
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0answers
49 views

Could I use liquid cristals to create a panel that turns my tv in a 3D tv?

Say you have a non 3D TV / Display / Monitor / whatever with a 60hz refresh rate. Using a custom software, you would tell the monitor to display: the first frame of the 60 frames, would be the frame ...
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3answers
707 views

Why/when would you use a light to frequency converter?

I have looked at the TSL235 light to frequency converter and for measuring ambient light it seems expensive (~$1.50). What application would you have for using a light to frequency converter vs a ...
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1answer
71 views

Illuminating the wall of a transparent tube

I have a plastic tube that has a wall thickness of around 3 to 4 mm and it is transparent. I am trying to build a ring for the top of the cylinder that just illuminates the sides of the tube, but ...
0
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1answer
62 views

Reduce RF noise from a DC inverter

I have got this strip of EL light. I am using it in a project where I am also using 2.4g and 5.8g band of RF. The DC inverter creates a lot of RF noise (understandably) as it's inverting from DC 12v. ...
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0answers
91 views

How do I prevent a bulb from dimming?

I am powering a 4W bulb from a 12v lithium-ion 9.8Ah battery. My problem is the bulb dims after a couple of hours. Is there a component I could introduce to the circuit that would keep the bulb ...
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2answers
138 views

Infrared LED vs halogen light output comparison

I am thinking of using a high power ~50W IR led. I am wondering if LED IR is more efficient than halogen as is the case with visible light LED's? I couldn't find the light output of either IR halogen ...
11
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3answers
750 views

Why does the intensity of light in LEDs not increase with current after a particular value?

I read in books that light intensity from an LED does not increase beyond a certain value of current. The amount of light emitted depends on the combination of holes and electrons. If so, then as the ...
2
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1answer
82 views

Transformer and a relay in series - but function like in parallel, but not exactly

I've been doing some planning to build a home automation system on top of the existing power infrastructure of my house. The first thing would be making my light switches smart. My original plan is ...
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5answers
220 views

how to provide light for multiple 12 v led lights for 2 weeks

I'm participating in an art show soon in which I am making "sculptural light paintings" of which require a few 12v LED strips. They're the kind that work in aquariums and car's taillights and whatnot, ...
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2answers
81 views

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

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 ...
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2answers
79 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 ...
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1answer
64 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 ...
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2answers
109 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
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2answers
81 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 ...
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1answer
79 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". ...
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4answers
809 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
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1answer
148 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 ...
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2answers
694 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 ...
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1answer
72 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 ...
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3answers
60 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 ...
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5answers
102 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 ...
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1answer
61 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 ...
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0answers
59 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 ...
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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
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2answers
133 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 ...
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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 ...
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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
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3answers
286 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
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1answer
263 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 ...
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5answers
228 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 ...
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1answer
128 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
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 ...
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1answer
74 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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0answers
38 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
153 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
384 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
179 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
193 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
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1answer
33 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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0answers
89 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
149 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
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2answers
484 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
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1answer
36 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 ...