WHY DID MY BED SHEET GLOW GREEN WHEN TOUCHED? - PHYSICS …
Oct 24, 2013 Very weird luminous bed sheet ?? I spent the night at another place yesterday. At night, the bed sheet (which was a bit "plasticy") would shine intense greenish light when I run … From physicsforums.com
DIFFRACTION GRATING WITH MONOCHROMATIC LIGHT VS. WHITE LIGHT?
Dec 21, 2013 (A) What kind of pattern of would you get if you shone monochromatic light on a diffraction grating? What pattern of light would you get if you shone white light on a diffraction … From physicsforums.com
WINDOW DETECTOR CIRCUIT DESIGN: LED ACTIVATION FOR VOLTAGE …
Oct 28, 2011 So as you can see I'm trying to make a window detector circuit that makes an LED turn on if the voltage is below or above a certain threshold. In this case, I want the LED to turn … From physicsforums.com
WHAT IS THIS ELECTRICAL COMPONENT CR - PHYSICS FORUMS
Jan 13, 2012 What is this electrical component "CR"? Hey folks, Can anyone give me a hint to what the CR symbol in this wiring diagram might mean? I'm thinking it is some kind of switch... From physicsforums.com
FOCUSING UV LIGHT FROM A 275NM LED DOWN TO A SMALL SPOT
Jul 30, 2022 Hello, I'm trying to focus a 275nm (with proper safety precautions) LED that looks to be a few mm in length and width (the light-emitting portion) to a smaller dot size. The LED … From physicsforums.com
CONTROLING THE WAVELENGTH OF AN LED THROUGH VOLTAGE?
Jul 27, 2013 An LED will drop a relative constant voltage (although not perfectly constant) regardless of the current through it. Of course there is a usable range before damage occurs. From physicsforums.com
Feb 14, 2018 For an LED to work and emit light, one wants the current to come out of cathode, which is the pointy end in the figure. View attachment 220324 To be more confusing, For a … From physicsforums.com
UNDERSTANDING THE EFFECT OF DUTY CYCLE ON THE BRIGHTNESS OF LEDS
Aug 13, 2020 The brightness of an LED is a result of the current passing through it. The current is a function of the voltage across the LED. The duty cycle represents the percentage of the … From physicsforums.com
HOW MANY LED'S ARE IN A TYPICAL LED MONITOR? - PHYSICS FORUMS
May 19, 2010 A single pixel only puts out one color (red,gree or blue) groups of three or four pixels are used to give all the colors by varying amounts of these primary colors. ps .There are … From physicsforums.com
CALCULATING OF THE HEAT DISSIPATION OF A LED - PHYSICS FORUMS
Jun 1, 2022 Welcome to PF. At best, you can expect about 20% quantum efficiency from an LED. The heat will therefore be greater than 80% of total power input. You must run the LED … From physicsforums.com
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