led

Light-emitting diode
Note: Televisions marketed and described as 'LED Televisions' are LCD televisions with LED backlighting or edgelighting. The LED back/edgelighting technology is somewhat more efficient, usually thinner and arguably more attractive than the CFL lighting using in conventional LCD televisions.
A light-emitting diode (LED) is a two-lead semiconductor light source. It is a p–n junction diode, which emits light when activated. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor.
An LED is often small in area (less than 1 mm2) and integrated optical components may be used to shape its radiation pattern.
Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared light. Infrared LEDs are still frequently used as transmitting elements in remote-control circuits, such as those in remote controls for a wide variety of consumer electronics. The first visible-light LEDs were also of low intensity, and limited to red. Modern LEDs are available across the visible, ultraviolet, and infrared wavelengths, with very high brightness.
Early LEDs were often used as indicator lamps for electronic devices, replacing small incandescent bulbs. They were soon packaged into numeric readouts in the form of seven-segment displays, and were commonly seen in digital clocks.
Recent developments in LEDs permit them to be used in environmental and task lighting. LEDs have many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved physical robustness, smaller size, and faster switching. Light-emitting diodes are now used in applications as diverse as aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, camera flashes and even LED wallpaper. As of 2015, LEDs powerful enough for room lighting remain somewhat more expensive, and require more precise current and heat management, than compact fluorescent lamp sources of comparable output.
Light-emitting diode - Wikipedia, the free encyclopedia
  1. DPinBucks

    Possible cure for glowing LED light bulbs, please

    Two of our bedrooms have identical light fittings: 3 G9 bulbs in each. Originally they had normal 35W halogen capsule bulbs, but I replaced them with LEDs. Not knowing any better at the time I bought cheapo ones from Amazon, and they have worked well except for one thing: they still glow...
  2. S

    Question Tv/Soundbar combination advice please👍

    Hi everyone, we are currently looking at buying a new tv and soundbar. We were going to go with a 65inch C3 and the USC9S soundbar but I am having doubts as we have 3 kids and the screen may prove too dim for daylight viewing in bright rooms. I’m tempted to go with the Sony X90L xr and pair it...
  3. H

    Led Strip issues with WLED app

    Hi, I just recently bought from Aliexpress 1 metre of WS2813 led strip and also GLEDOPTO ESP32 WLED LED Controller. This is the first time of using the products as i wanted to experiment of using these and want to use these things for future DIY project. I need help with how to connect the led...
  4. Jason56d

    Question Hue light strips advice

    Hi all. I am in the process of changing our current media wall. We are going for a false wall and chimney breast set up, similar to @Broadsword old one here: We are going to have 6 recessed shelves and I would like to have a led strip in each. I purchased a Hue 2m lightstrip kit and a 1m...
  5. techted

    The invention of the Blue LED

    OLED displays are a technological marvel as all of us who own an OLED TV will attest to. For the longest time, only red and green LEDs existed. Without a blue LED, we could not get a white LED light and all the colours in between. Hence, LEDs were relegated to just simple indicator lights...
  6. xar

    LED wifi controller not working

    Hi all, I have an RF and wifi controller device for 5m of white LED strips (link below). Been working for years on both the RF remote and via Alexa on an echo dot (which is my primary control tool) However, I recently killed the broadband in my house by drilling through the cable coming in...
  7. Ian Collen

    NEWS: Roku teams up with Currys to launch new Logik Roku TVs & comments

    The range of 2K HD, Full HD, and 4K UHD LED TVs will come in 32 to 50-inch sizes, with prices starting from £149.99. Read the news.
  8. D

    Answered Help please with choosing a Soundbar to connect to a Samsung UE43CU8500 (2023) LED HDR 4K Ultra HD Smart TV, 43 inch.

    Assistance please; bearing in mind I am not a techie by any means. I have just purchased the above TV and, as I expected, the sound quality is not as good as I would like. Therefore I am venturing into the soundbar world for the first time ! Basically I am not looking for cinema surround etc etc...
  9. L

    Car headlights.

    I have just fitted some LED headlight bulbs on my car, it was a bit of a faff as I had to access them under my wheel arch. When testing tonight I noticed that my left light seems to throw higher than the right light. Is this normal, if it is I guess it's to prevent you dazzling drivers who will...
  10. Llessur

    Screen issue: please help.

    Hi, I'm more hifi than tv, but I love listening to it though my system, but the screen (led) has developed a problem which you can see in the pics. So I looked online about it but of course there was loads of bs answers. I downloaded white noise and other vids which 'should' have fixed the...
  11. K

    Which led strip for ceiling

    I'm currently renovating a house, and the main room will be a living room / cinema room . I've dropped the ceiling leaving a gap all the way round the edge to mount a discreet led strip. I think in total I'll need about 15m of led's. From a quick bit of research the best one seems to be the...
  12. H

    Budget 50" TV

    I am giving myself a headache searching forums, reading reviews etc. so I thought I'd ask the question. I am after a 50" TV and my budget is £400. It is for a lodge we have so the place is very light. The current 43" JVC can struggle with the light a bit but is fine on a night. I have a...
  13. P

    Question Panasonic TX-P42G30E - Black screen. No stand-by/red led, only green

    Hi all, My Panasonic TX-P42G30E stopped working. When I turn on the tv, the screen stays black and I only see a green led blinking about 6 times before it's getting solid green. There's no red led turning on, which usually indicates it's on stand-by mode and it's also not blinking red. Strange...
  14. 0

    Sharp LC-70EQ10U no backlight. frnt LED long blink short blink

    i tried the reset. the led stays on for around 20-30 seconds like it's trying, then starts the blink routine again. I checked the voltages to the led backlighting all are zero volts. wondering if the power supply is in protection mode or is it the power supply. should the voltages be there if...
  15. sanjit

    Samsung QE85QN95C NEO QLED TV backlight failure after 28 days!

    Bought from Currys on New Years day and delivered on the third of Jan only for the backlight to totally fail (sound but no picture) you can make out the image very faintly using a torch, very disappointed that such an expensive flagship model could fail in a short space of time, off the Currys...
  16. BourbonKing

    Samsung UE50H5000AKXXU 50" LED TV - Faint Glow When In Standby

    I've noticed that my trusty 2014 Samsung UE50H5000AKXXU 50" LED TV has only very recently started adopting a faint but perceptible glow (like a very dark blue-black) some point after turning off into standby mode using the remote control. It doesn't always occur it would seem but I've seen it a...
  17. MahaRaja

    Is 2024 the dominant year of Mini-LED TVs?

    Hi folks, As the title says, this year is going to be the year or start of the rise of Mini-LCD or aka Mini-LED TVs. We know that this year, Sony is focusing on releasing their high end and very advanced Mini-LCD TV, so much so that it's taking attention away from their premiere OLED models, it...
  18. lynx

    Rear led light coding...VAG.

    A neighbour knows I have VCDS and has asked if I will code their rear indicators with either the kencha or pace car/ urban joke indicator mod. Do any of you guys know the legality of this and the MOT situation before I get involved?
  19. amorgan3105

    Question Connecting LED strips to ceiling switch

    Hi All Sorry if this has been asked before. Can you wire up a UK ceiling light switch straight up to a LED strip transformer? I want to put LEDs in the coving and the only current power source is the plugs near the floor. Ideally I don’t want a cable running from my coving to the plug socket, so...
  20. K

    New kitchen extension led strip light set up regarding voltage drop.

    New kitchen and extension being built and would like to incorporate 2 or 3 led zones. Ideally 2 but 3 if need be due to potential voltage drop on the larger zone. Zone 1 will be typical kitchen style under wall units and work top profiles. This i forsee no issues as will be in a smallish...
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