LEDs

AC Powered LEDs Could Cut The Cost Of Lighting IEEE Spectrum – IEEE Spectrum

https://spectrum.ieee.org/energywise/semiconductors/optoelectronics/acpowered-leds-could-cut-the-cost-of-lighting “Engineers at Pennsylvania State University have demonstrated a practical way to integrate gallium nitride LEDs and their power supply circuits onto the same chip using industry-standard manufacturing processes.” The results promise a cheap lighting chip that runs directly from the AC electricity supplied by a wall outlet (110-120V AC). Researchers say that this makes

LED flashlight battery holder resistance

I had some broked LED flashlights and I thought of using components from them. Especially the compact battery holder that takes three AAA batteries looks useful in other small projects. Those worked OK when lightly loaded. But when I started taking current for a small motor, I could not get acceptable power out of them.

LED lighting can disrupt radio communications | Southgate Amateur Radio News

http://www.southgatearc.org/news/2018/october/led-lighting-can-disrupt-radio-communications.htm#.W9XAslNyg0M Dutch amateur radio society VERON reports the current EMC standard, developed in the last century, no longer suffices. “The faulty LED lights disrupt wireless connections in and around the house. Radiocommunications Agency therefore starts an investigation into 50 LED lamp suppliers.” “A number of lamps do not appear to meet the EMC standard. Especially

Cheap eBay LED tester fixed

Found this from eBay for about 2 dollars: New Mini Handy 2~150mA LED Tester Test Box for Light-emitting Diode Bulb Lamp Description: 100% brand new and high quality Material: Plastic Color: White Handy device for testing LED’s. Simply plug your LED into the correct holes (all of which are marked) and push the button to

LED Energie LED bulb teardown

LED Energie brand LED bulb with following data stopped to work properly: 230V 50Hz 7W E27 450lm 3000K 60mA 20D 3684 Mod.5161 So lets make a tear-down Inside There seems to be 20 small LEDs in series inside bulb and one of them burned black. As such this LED string is expected to need around

LED lamp with UPS tested

I got several LEXXA 7W LED-VARAVALO bulbs in hoping to replace some aging LED light bulbs with new ones that have a bonus feature: They have an internal battery that allows them to output light even when the mains power is turned off. Those were available cheaply from Finnish shop Motonet (bulbs with pretty similar

Modular LED lamps with IoT

The lighting industry is undergoing a revolution driven by LED technology. LED is is now the dominant lighting technology for all new buildings and retrofits. Yet today, only a small percentage of LED fixtures are supplied with IoT sensors installed. It was estimated 140 million LED fixtures were expected to be distributed in the United

LiShield Can Block Smartphone Cameras for Privacy’s Sake – IEEE Spectrum

Phttps://spectrum.ieee.org/tech-talk/consumer-electronics/audiovideo/lishield-can-block-smartphone-cameras-for-privacys-sake Rules that prohibit photos or videos can prove almost impossible to enforce when nearly everyone carries a smartphone. But a new indoor privacy system has shown how the power of smart LED lighting could prevent people from taking illegal videos of a live events. LiShield has a capability to corrupt digital camera images and videos without