Posts

Showing posts from January, 2018

A Caledonian Experience--- 2

Image
Scottish Highlands, Castles & Whisky


As our guide drove towards the city of Stirling, he told us about Scottish Highlands-Lowlands divide and their history . We approached Stirling Castle through the wynds of the old town. The attractive 14th century castle atop an intrusive crag appeared to be sheltering and dominating the old town with ancient  buildings and cobbled streets. It was windy and drizzling. Inside there were the wonderfully preserved Great Hall and Great Kitchen of the Royal Palace built by King James V. Mary, Queen of Scots, is among the many Kings and Queens of Scotland who have been crowned as well as lived there. Even the legendary hero of the folklore King Arthur’s name is linked. Although a 5th century character, King Arthur’s Round Table was discovered on the castle ground by archaeologists. Despite the naturally strong and defensive position of the castle, history recorded eight sieges. Only Romans bypassed Stirling. Instead, they built a fort at Doune. Throug…

Human Centric Lighting

Image
What is Human Centric Lighting?- An illuminating talk by Professor Warren Julian

Human Centric Lighting Design is an old Concept, given that our circadian clock runs on a 24 hour cycle. But It was difficult to maintain the circadian entrainment effectively with traditional lights. With the advent of LED, having expanded colour capabilities and seamless control on colour changes and dimming, a lot of research is underway to make our visual system respond more effectively to the light stimulus. Dynamic Tunable LED, varying the spectrum from 6500K to 2700K, has increased the circadian effectiveness of the human system. Increasing daytime alertness and nighttime sleep can be addressed in near future by acutely synchronizing the circadian system of human beings with proper doses of red and blue light. A brilliant presentation on Human Centric Lighting was made at Hong Kong International Lighting Fair 2017 by Professor Warren Julian of Sydney University. I have tried to reproduce the origina…