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

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2answers
25 views

How can I make multiple EL panel flash?

I was looking at this el panel and wondered if it is possible to make each panels flash successively? What do I need to do / use in order to achieve my goal? Thanks!
0
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2answers
36 views

What is a suitable material to cover photo voltaic panels?

I'm building a small, portable, modular solar panel array to charge 5V power banks, phones, etc. I got most of the electronics down, the Step-Up converter, by-pass diodes, blocking diodes, as well as ...
4
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3answers
88 views

repeatedly turning an incandescent light bulb on and off every 20 seconds will cause damage to the bulb?

I have seen similar questions to this one but none of them were asked in the range of seconds only minutes. I just finished building a incubator for chicken eggs and I am using an incandescent light ...
4
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2answers
547 views

What does the circuit look like to switch two lights using two switches into four different states?

At my workplace there's a room with two entrances, each featuring a push button light switch, A and B. There are two ceiling mounted lights, 1 and 2. Switch A switches both lights on/off. Funny ...
2
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2answers
426 views

If I flick the light switch on and off will it damage the light?

Ive heard that when you flick the light switch on and off repeatedly it damages the bulb. I know this is certainly not true for LED bulbs, but Im wondering if and how it damages other kinds of ...
0
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2answers
56 views

Bulb replacement in a car 12V 60mA vs 14V 65mA

The climate control in my car needs to have some backing lighting bulbs replaced. Can I use a 14V 65mA bulb instead of the 12V 60mA bulb that is suggested by other people who have replaced these ...
0
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2answers
70 views

Sensing directional light

I am looking to detect the amount of light coming from a specific direction that lands in a specific area on a PCB. In my research, I have only found ambient light sensors and never any kind of ...
0
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1answer
30 views

Creating a Strip of Light Using LEDs

I am looking into creating an illuminated string of leds where the individual LEDs are not visible, but that a shape is illuminated. The shape would be a various sized rings the biggest being about ...
0
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1answer
58 views

SSR not switching dimmed load

I have a system where there is a "master dimmer" (an 800W dimmer designed for household lighting). From that master dimmer, I have a few SSRs switching 40W incandescent light bulbs. The idea being ...
0
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1answer
45 views

Light Detector/Identifier circuit using photodiodes

I'm currently completing my final year project and am currently stuck going round in circles as how to complete it. To summarise: I need to design a circuit which is capable of IDENTIFYING a light ...
0
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2answers
65 views

Why would an electronic timer have a minimum load?

I need to replace an electronic timer lightswitch, and both the old one, and this example of a replacement, state that they have a minimum load of 40w. Why would the switch have a minimum load, and ...
-2
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2answers
65 views

How bright are the dimmest LEDs and what's their typical usage? [closed]

High power extremely bright LEDs are more and more popular in various lighting applications. What about extremely dim low power LEDs? How bright are those and how are they typically used?
2
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4answers
415 views

Controlling AC light bulb intensity

I saw in some movies that indoor light intensity is controlled with human presence and distance from the sensor (the lower the distance, the higher is the light intensity). I am very interested to ...
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6answers
117 views

Which light bulb will burn out? [closed]

We have 5 light bulbs connected in series assuming all bulbs have identical characteristics. The environment is identical for all bulbs. Wire is superconductor (0 Ohm) and is thick enough to deliver ...
0
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1answer
81 views

Wiring a lamp in [closed]

Hi guys I'm very new to electronic wiring so take it easy on me. I have a drone that I'm trying to connect a little 12v floodlight too so that it can see at night when it flys; the problem I'm having ...
-1
votes
1answer
76 views

How to measure voltage of a track lighting fixture?

My house has track lighting that takes MR16 halogen bulbs. I would like to measure the voltage being put out by the fixture using a multimeter. I removed one bulb, set my multimeter to V-DC and ...
18
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3answers
2k views

Why are there only RGB and RGBW-LEDs, but none with more chips inside one housing?

In another thread the question emerged, where the LEDs with 5 or more dies of different colours are. (Kudos to Brian Drummond) The background is as follows: RGB LEDs are very popular for creating ...
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4answers
161 views

Can I use an ethernet module (or an USB connection) for light communication? [closed]

I'd like to transmit data (e.g. copy a file between two computers) at high speed via light. I found lots of examples around the web but mostly the speed is really slow because a serial connection ...
1
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2answers
92 views

Am I having a power supply issue with my LED lights strips in series, or have I done somethine else wrong?

I bought two LED light strips and connected them together end-to-end using a solderless snap connect. The strips are each 5 meters long, "LEDMO SMD 2835 White Non-waterproof LED Light Strip - DC12V ...
0
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2answers
97 views

solar panel: how much energy has been charged?

first time here and still learning. I have just ordered a 100W solar panel with these specs: V:21.61V I:5.73A I am aware that to calculate the power output i can multiply V x I. However the ...
3
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1answer
50 views

Solid-state lighting [closed]

Background Consider the following technologies: 100 lm/W OLED (2008, source) 303 lm/W LED (2014, source) 94 lm/W LEP (2015, source) For growing food, the preferred measurement is ...
0
votes
1answer
24 views

~12VDC+ Automatic Dimmer Switches

Most automotive vehicles typically have their interior lights fade out 30 seconds or so after the doors are closed. The way I understand it, closing the door will usually depress a momentary on/off ...
5
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2answers
116 views

Electrically switching between horizontal and vertical light polarization

I would like to be able to electrically switch between horizontal and vertical light polarization. This polarization filter is supposed to be portable attachment running on a battery in front of a ...
0
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1answer
97 views

Amount of light by an LED

I am supposed to use an light having the following specs. as described in the below statement. "A red light, equivalent in its luminescence to a 21 W light bulb is to be used." On an average how ...
0
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4answers
92 views

Light effiency or efficacy and watt to heat output

I am on a light forum and there are debates about watt heat output of lights. I'm using my common sense for the debate but can't find the data online to support my ideas. People are thinking that ...
1
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1answer
445 views

Why are “flicker flame bulbs” always bulbs or how do flicker flame bulbs work? [closed]

In other words, I've never seen the type of filament (if filament is the correct term—if not, what is the correct term?) outside of a bulb—as seen in the video linked to below. Is there something ...
2
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2answers
92 views

Electric light bulb burns out

Why electric light bulb more often burns out when we switch from OFF to ON our wall switch, but not during regular work? What happens to it so it burns?
0
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0answers
28 views

What's the wavelength range of standard low-cost unfiltered CCD chips?

I removed the infra-red filter from my webcam to play around with the infra-red spectrum. To better know what I'm doing, I'd like to know: What is the usual (approximate) wavelength range of the red ...
1
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0answers
64 views

Idea for a modern LightGun, would it be possible?

Old lightguns used CRT monitors to work, and are not compatible with modern systems anymore. I've com up with an idea and would like to know if it's doable and what problems there could be. The idea ...
0
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0answers
158 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 ...
0
votes
2answers
82 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 ...
1
vote
2answers
95 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 ...
2
votes
5answers
449 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?
1
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2answers
77 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 ...
5
votes
3answers
846 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 ...
0
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1answer
126 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
votes
1answer
107 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. ...
0
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2answers
328 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
1k 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
votes
1answer
91 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
1k 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, ...
0
votes
2answers
169 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 ...
-1
votes
2answers
162 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
99 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
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2answers
126 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
262 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
368 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". ...
5
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4answers
1k 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
200 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
785 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 ...