Calculating of the heat dissipation of a LED - Physics Forums
Jun 1, 2022 · The heat will therefore be greater than 80% of total power input. You must run the LED cool for high efficiency, and for long life. That suggests you should design for 100% heat generation. Vf = 2.85 V. If = 700 mA. Maximum heat generation is 2.85 * 0.7 = 2.0 watt. At best, that might be a 20% overestimate. Jun 1, 2022. #3.
How many LED's are in a typical LED monitor? - Physics Forums
May 19, 2010 · 4. Do all LED monitors have the same number of LED's? No, the number of LED's can vary depending on the manufacturer and model of the monitor. Some high-end monitors may have more LED's for better color accuracy and brightness, while budget monitors may have fewer LED's to reduce costs. 5. Can the number of LED's affect the quality of the display?
Condenser lens retrofit for a lighting application - Physics Forums
Oct 2, 2024 · PhilR said: there is a fundamental problem. Extent is less relevant if your lightspot diameter is a lot bigger than the diameter of the light source. COB LED are stamp-size to 72mm for a 1500 Watt (at $ 1350 ). Commercial solutions for 'the sort of results you are going for' aplenty, like here, or here.
Why is a current produced when shining light into LED - Physics …
May 6, 2009 · Shining light into an LED produces a current because of a process called the photovoltaic effect. This effect occurs when photons from the light hit the LED's semiconductor material, causing electrons to be excited and move from the valence band to the conduction band, creating a flow of electricity. 2.
Collimating incoherent light emitted by a LED - Physics Forums
Nov 20, 2012 · The collimation of incoherent light emitted by a LED can be measured using various techniques such as beam profiling, interferometry, or by using a collimator with a known beam angle. These methods can help to determine the degree of collimation and assess the effectiveness of collimation techniques.
How to calculate slit separation? - Physics Forums
Feb 23, 2016 · To calculate the slit separation for a double-slit experiment, you will need to know the wavelength of the light being used, the distance between the slits, and the distance between the slits and the screen where the interference pattern is observed. You can use the formula d = λD/d, where d is the slit separation, λ is the wavelength, D is ...
Invisible Ink that you can see through an IR lens - Physics Forums
Jan 26, 2021 · Yes, invisible ink that can be seen through an IR lens can be used for practical purposes such as security markings or to prevent counterfeiting. This type of ink is also commonly used in escape rooms or scavenger hunts as a fun way to create clues or puzzles. 5.
Can a magnifying mirror or prism be used somehow as a low-tech …
Sep 7, 2024 · The magnifying glass is widely used as a low-tech assistive device for reading by the visually impaired. As magnifying power increases, the lens diameter must decrease, greatly constraining the field of view. But a magnifying mirror achieves high magnification over a broader field of view, and...
Optics Forum | Physics Forums
Sep 20, 2024 · A About collimation in Czerny-Turner spectrometers. Dec 24, 2023. Replies. 1. Views. 1K. I Calculating the Raleigh Criterion constant to 99 significant figures. Dec 21, 2023. Replies.
Incandescent Lamp: Red & Green Light Filter Color - Physics Forums
Nov 6, 2004 · 2. What is a red & green light filter color? A red & green light filter color refers to a type of filter that only allows red and green wavelengths of light to pass through, while blocking other colors. This can create a unique lighting effect when used with an incandescent lamp, as it will only emit red and green light. 3.