Tech news tagged ‘light bulbs’

Dimmer backgrounder for LED bulb designers

If you need to learn about dimmers, IWatt presented a very useful paper at APEC 2011 – Adaptive Chopping Circuit for Retrofit Dimmable LED Driver.

The presentation includes an excellent introduction to ‘good’ and ‘bad’ dimmers – the waveforms in the picture are from a ‘bad’ one – and what they do to…

Read More

LED driver circuit for 100W A19 light bulbs

An LED-driver reference design for an LED replacement of 100W  incandescent bulbs has been introduced by Power Integrations, writes Richard WIlson. Dubbed DER-322, the circuit is desigend to fit neat inside the A19 form factor, is EN61000-3-2 C (D) compliant and easily passes THD limits. With…

Read More

Lasers trump LEDs for lighting your house

US researchers at Sandia National Labs have demonstrated that people are comfortable with viewing objects lit by four coloured lasers – blue, red, green, and yellow – instead of white LEDs or light bulbs, writes Steve Bush. Lasers are extremely narrowband, 10x narrower than the blue LEDs used in ‘white’ lighting LEDs…

Read More

LED bulb from Cree emits a 2,700K colour temperature

Cree has demonstrated an LED lamp to replace 60W light bulbs. The prototype is dimmable and emits an incandescent-like 2,700K colour temperature with a colour rendering index (CRI) “of at least 90″, claimed the firm. It delivers over 800 lm for under 10W consumption…

Read More

Site update: Energy consumption benefit of efficient LED lighting

An LED Lighting-related article has just been posted on Electronics Weekly: Researchers calculate oil consumption benefit of energy-efficient LED lightingIf all of the world’s light bulbs were replaced with energy-efficient LEDs for a period of 10 years, researchers at the US Rensselaer Polytechnic Institute claim, oil…

Read More