LEDs

LED car lights

LED car headlights are a promising technology. They have many advantages over filament bulbs (longer life, faster on/off times, lower power consumption) but the technology has still limitations. LEDs can be used as car headlight when the lighting system is specifically designed for LEDs. There are even some DIY projects for this. The current LED

LED vs Fluorescent Tubes

Are LED Fluorescent Tubes Ready for Prime Time? I got a mail on interesting survey is on LED vs Fluorescent Tubes at http://www.softwareadvice.com/articles/construction/are-led-fluorescent-tubes-ready-for-prime-time-1041920/. The survey concentrates specifically, if LED tubes are ready for widespread commercial use, and if they will replace fluorescent tubes. The writer of that blog is reaching out to a few bloggers

Inside LED bulb

TESS, a Taiwanese manufacturing company, recently introduced a 7W LED bulb that, at 560 lumens, can serve as a replacement for a typical 500-lumen, 40W incandescent bulb. Tear-down: inside a 7W LED light bulb article shows you what is inside that lamp. This LED lamp bulb holds seven 1W LED packages (a package of multiple

Broadband using LED lamps

Broadband through LEDs tips up article tells that German Scientists believe the light coming in to your home could by encoded to receive a wireless broadband signal. The scientists think they can transport data at high bandwidths (currently 230Mbps) by generating a signal in a room by slightly flickering all the lights in unison. The

LED lamp challenges

Nowadays there is ENERGY STAR rating for solid state lamps in USA. Solid-state lighting (SSL) products that meet efficiency and performance criteria set by the U.S. Department of Energy can earn the ENERGY STAR. For more details refer to the ENERGY STAR Requirements for SSL Luminaires. In December 2009, DOE published ENERGY STAR criteria for

OLED display is not dead

Organic light-emitting diodes (OLEDs) are solid-state devices composed of thin films of organic molecules that create light with the application of electricity. OLEDs are a promising technology for flat panel displays. Compared to standard LCDs (including those with LED backlighting), OLED displays offer better contrast ratios (no trouble producing ‘true’ black’), require no backlighting at

Burn out: Weak links affect HB-LED lifetime

High-brightness LEDs for solid-state lighting can last 50,000 hours or more, but the components surrounding them generate heat that can cause early failures. The early failures can be seen on many LED products, especially the cheap ones. Lighting products have historically been reliable, but as electronics-rich CFLs (compact fluorescent lights) began to replace incandescent bulbs,

Use an old Nokia charger to power 1W LED

Here is one useful trick I invented when looking around the transformers/power supplies I had. NOKIA ACP-7 Europe Standard Charger (Original) has a specification of 230 V, 50 Hz, 4.8 VA. Output 3.7 V, 355 mA. A normal 1W white LED is driven with 350 mA maximum continuous current and typically 3-3.8V voltage drop over