The light tag has no wiki summary.
2
votes
2answers
105 views
Energy-efficient LED driver circuit
I want to light a normal LED for as long as possible on two AA or AAA batteries. It does not have to blink or so, just stay on. The LED doesn't have to light at the max, as long as it's visible from ...
0
votes
1answer
106 views
How can I power the blue LEDs separetely on this aquarium light?
I have a Beamswork LED aquarium light like this. It has a 3 way switch:
All LEDs off
Blue LEDs on only
White AND blue LEDs on
It has a single mains power plug.
What I want to do is make it have ...
-1
votes
1answer
38 views
Optoelectronic lab involving filtering of image with white light [closed]
This is an optoelectronic lab experiment involving filtering of the stylised image of a house with white light and grating.
The objective is to filter the bars on the upstairs window and the ...
2
votes
2answers
125 views
How much can I safely plug into a light socket converted to a standard outlet?
I just moved my office desk from our extra bedroom on to our stairway landing. The tricky thing was that there was no wall outlet to plug anything into. However, there was a nearby light socket, ...
0
votes
1answer
113 views
Light bulb exploded [closed]
This morning, one of the lights in my house began to flicker. I didn't think much of it, and left the room to get a drink. While I was in the other room, I heard a bang, and came back to find broken ...
1
vote
1answer
73 views
How to switch light on by standing on a mat
I'm working on a project for school. And I have this dance matt. As long as you stand on that matt the light should go on and stay on until you step off the matt again. But I have no idea how to make ...
0
votes
1answer
101 views
virtual light communication
I have to design a project that uses an LED to transmit data and a LDR to receive the data or signal from the LED. But the problem is I have to use two Arduino UNO boards, one for LED transmit and ...
6
votes
3answers
324 views
Continous light - do LED s flicker like fluorescent lights?
Continous light - do LED s flicker like fluorescent lights?
Under flourescent light there is a flicker.
As i understand LED work only with DC current, thus they have a AC to DC transformer circuit ...
-6
votes
1answer
46 views
Ceiling light holder [closed]
I touched the wires of a ceiling light holder with plyers, it made a spark and all of the power in my room was gone. WHAT DO I DO?
-1
votes
1answer
108 views
LED RGBW Lighting, Will this Design work?
I've got this schematic for a very small lighting setup for my basement. The goal is to have two fixtures that have red, green, and blue lights that can be controlled with knobs on a Separate ...
34
votes
6answers
5k views
Does turning a lighbulb on and off repeatedly use more energy than just leaving it on for hours?
Let's say I have a 60W bulb in a lamp in my bedroom. If I kept the lamp on for 2 hours straight but the next day, I switched it on and off 10 times in intervals of 5 minutes. Which scenario would use ...
6
votes
2answers
326 views
How to start with creating a device?
I have recently wondered if I could build some kind of useful and cool device, using some sensors, transmitting signal and doing something with it - I think people who answer questions on this site ...
4
votes
2answers
270 views
Basic circuit to keep LED either on or off depending on night/day
How can I have a LED either on or off (not in between) depending on night or day with basic electronics? I have created the circuit below, but it only shines and in darkness it dims.
The ...
0
votes
2answers
175 views
Do dimmer switches work properly with any kind of lamp? [closed]
I have a dimmer switch installed in my room that I like very much, but lately incandescent lamps became harder to find, and soon (in a few years or so, if I'm not mistaken) they will be gone to be ...
0
votes
2answers
170 views
LED brake lights - detecting voltage drop?
I am trying to light up some LEDs on my Rustler VXL RC car only when braking/reversing.
I found out that on my receiver I have three wires: black(-), red(+), white(+). The one that interests me is the ...
