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

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21 views

Spot light LED bulbs (MR16) flash once when turned on. If I put 1 normal halogen in then it solves the problem. Why? [closed]

I have 5 spot light bulbs in my bathroom. All use MR16 connection. I replaced them all with 5w LEDs and when I turn on the switch they flash once then go off. If I remove one so there's only 4 then ...
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2answers
87 views

Would the frequency of LED be equal to that of microcontroller

Suppose I have a simple LED driving circuit i.e. an LED and a resistor in series which is driven by a pin of a microcontroller. Now I set the frequency of this pin to say 1Khz, will the LED flash with ...
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4answers
73 views

Audio transformer for 12V light emitting circuit

I'm working on transmitting audio through light using amplitude modulation of an LED, received by a solar panel connected directly to an active speaker. Something like this: simulate this ...
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1answer
43 views

Non-led simple bicycle dynamo light system

There have already been questions about how to build a bike power supply based on the bikes dynamo. Most of the answers contained lots of basic components. Some answers here are making a full wave ...
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0answers
31 views

What kind of sensor i should use to detect object that blocked the light?

i want to ask about the sensor i should use for this problem. My problem is i want to detect if there something blocked the light. Im also ignore light from environment, so consider there's no light ...
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1answer
95 views

How do I build a Circut to create temperature changes in LEDs? Looking for a range of 3000 to 6,000 for photography? [closed]

I see commercial lights for photography that can change color in the range of 3-6,000 or tungsten to daylight values. These are not arrays of three RGB lights but rather single LEDs and the ...
4
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3answers
195 views

P-channel MOSFET as high-side switch gets hot

So I'm trying to control my front lights of my car using an Arduino Nano. In total there are 14 lights (including foglights and blinkers etc.). I'm using two 75HC595 shift registers to control these ...
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0answers
65 views

How to make several separate led lights look like homogenous light source?

I have several LED lights and I want to make sure they look like one strong light. So what I have now will look like this: Or maybe: And my aim is to make it looks like this: While doing ...
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2answers
27 views

Ground wire in custom capacitance-dimmable metal lighting fixture

I'm wanting to design my own lighting fixtures, both for cost effectiveness as well as the design appeal (inspired by a particular designer's lighting fixtures) that uses a wooden base with metal ...
0
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1answer
75 views

Automatic Temperature Controller with Thermistor (Incandescent BULB)

I'm new in this site And sorry for my english language.. I need a circuit for my little oven. I use an incandescent bulb (4x100W) for heating, and I want make a dimmer circuit to change output using ...
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1answer
106 views

Is there a digital input that registers light? / Can only ADC pins register signals from an LDR?

I have been building a traffic light over the past year as a GCSE project. Initially, what was unique about it was that, the pedestrian interface would light up when it was dark outside. Subsequently, ...
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2answers
41 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
108 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
574 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
485 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 ...
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2answers
136 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
93 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 ...
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1answer
33 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 ...
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1answer
79 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 ...
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1answer
60 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 ...
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2answers
89 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 ...
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2answers
69 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?
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4answers
516 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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1answer
84 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 ...
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1answer
116 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 ...
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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
176 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 ...
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2answers
153 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 ...
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2answers
118 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
53 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
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1answer
27 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
126 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
109 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 ...
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4answers
116 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 ...
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1answer
502 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?
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0answers
68 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
218 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
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2answers
87 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
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2answers
106 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
471 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
84 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
970 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
159 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
144 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
406 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 ...
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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
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1answer
92 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
2k 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
226 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 ...