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Questions tagged [lighting]

The tag has no usage guidance.

0
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2answers
46 views

Activating lights using a motion sensor?

I was wondering how I would configure some sort of setup to get lights like this turn on a timer once activated by a motion sensor. I want them to turn on for about 15 seconds and then turn off once ...
2
votes
1answer
29 views

LED Lumen Calculations

I am using an LED as a point source for a school project. I have two questions in regards to the LED(s). I know that light follows the inverse square law when measuring perceived brightness, but all ...
1
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0answers
38 views

Rube Goldberg, twisting in a lightbulb

For my rube golberg project I have to twist a lightbulb in and have it turn on. I have seen different videos on how they do it but they never explain it and most of the videos are blurry. We can't ...
3
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0answers
44 views

Street Light Arrangement Method

Hello I am a high school student and I am curious about how street light is arranged along the road. Is there government laws to install street light on the road or is the arangement of the street ...
0
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0answers
26 views

What plastics are commonly used for light diffusion?

I'm looking to create a mass-manufactured custom display similar to a seven-segment display found on alarm clocks. What material is commonly used to diffuse the light? The challenge I'm facing is ...
0
votes
1answer
118 views

how to implement autofocus for video projector

I have a modified pico video projector that I need to add an autofocus to. The focusing ring already has a fast stepper motor added to it. If the focus had to be done on the middle of the projection ...
4
votes
1answer
65 views

What plastic material blocks the most amount of light?

If I have a grid array of LED's surrounded by roughly 0.7mm thickness plastic walls. What material at this thickness would prevent light bleed side to side so that individual LED's can light up but ...
3
votes
4answers
88 views

How do I measure the brightness of a light bulb?

I am working on a science fair project. My question is if electricity moves better through a thin wire or a thicker wire. I need to collect data and make charts, and the thing I want to measure is the ...
2
votes
2answers
91 views

How to predict shadows of a house (3D modeling + sunlight)?

Imagine a house/building, seen from outside, at sunrise. As the the sun moves in the horizon, a) the shadow of the house is displaced/deformed, and b) some faces of the house have more/less sunlight ...
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0answers
44 views

Halogen light smells bad

I broke the protective glass of one of these and it smelled really bad. Is there some sort of gas inside that is meant to alert you that it is broken?
1
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2answers
215 views

LED color change in extreme cold

Which part of the LED is affected when it is exposed to liquid nitrogen? I have seen experiments showing LED's brightness increasing and color shifting, when the LED is submerged in liquid nitrogen. I ...
0
votes
1answer
31 views

LED controller to control individual RGB diodes remotely?

I'm working on a project which utilizes an iPad to change colors of individual lights in array of ~200 RGB LEDs. I have little knowledge of large-scale LED configurations and could use some direction. ...
0
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0answers
24 views

LED light illumination heat

Im looking for any of the thermal insulation material or any other technologies can eliminate the heat produced by the 3 W X 72 nos LED with 10 deg narrow beam Lenses.Its for some hospital related ...
0
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2answers
48 views

Does temperature affect the colour of the light emitted by an LED?

Suppose you have an LED that emits a spectrum of colours such that the resultant colour emitted is white. Will changing the temperature if the LED itself change the composition of the light's colour ...
0
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2answers
64 views

Is there a way to determine the colour information of light emitted from an LED?

Say you have an LED light that emits green light. Are there sensors out there that could accurately determine the colour information of the green light? Such as the relative values of red, blue and ...
1
vote
2answers
188 views

Diffuse uniform LED back lighting

Good morning/afternoon/evening, I am working on a project in my spare time, and was wondering how this effect is created. and I am going to assume this is more than just a cutout with an LED behind ...
0
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2answers
136 views

What is the significance of curvature in the arm of a streetlight?

I have been trying to find out the significance of the usual streetlight design - Why is there curvature of the arm holding the bulb of the light? I have been unable to any reason as to why it may be. ...
1
vote
2answers
110 views

Light bulbs with highest energy efficiency [closed]

Most specs for light bulbs list luminous efficiency (or, more accurately sometimes, luminous efficacy) but not energy efficiency. Luminous efficacy tells you how bright the light is as observed by a ...
0
votes
1answer
23 views

Thickness of a 3d print general purpose plastic/PLA 230 V ~ isolator?

I'd like to design a minimal thin light switch which holds an illuminant with standardized socket, e.g. E14, E27, and has itself such a socket to be screwed in a support and a switch which will be ...
3
votes
3answers
54 views

Animated light box signs

In the old days there was a type of sign/light you would find in bars and restaurants which was animated. It would be a lit scene usually of water, like a lake with a waterfall, and by some means it ...