Sunday, February 5, 2017

Is circadian lighting design necessary?



Indoor lighting is always a critical component for all types of buildings. Recent trends of green building brings forward designs that utilises windows, sun roof or even large openings where natural sunlight can reach inside a building easily.

While this green movement serves to conserve lighting energy, it also directly benefits the people working within the building by exposing them to natural lighting. We can then explore the concept of cicadian lighting systems; the pros and cons of natural lighting to our body biological system.



Following the sun set and sun rise cycle, the natural light emitted from the sun varies in intensity and color temperature and we may have very strong dependency with the sun cycle. Circadian lighting design is meant to simulate the intensity and color temperature of the sun cycle to promote productivity at work and a relax atmosphere reaching the end of the day.



To achieve the respective intensity and color temperature, lighting industry have come out with tunable white LED where it can produce various color temperature via dimming of intensity and a control system that is capable of changing the intensity at real time. This is still a relatively new concept as the science and lighting technology have not yet merged together completely but companies in the United States are getting them installed improve productivity.

I feel that it would be necessary for circadian lighting design to advance further. With the flexibility and stability of LED lighting technology, there is the potential to provide more lighting design to benefit our human body and internal body clock. Gradually, the benefits may encourage more research into a better tunable bulb or white LED that have a wider and precise range for the color temperature.

Article written by: Mr Tan Chin Koon, 3rd Year Nanyang Technological University, EEE

References:
1) http://luxreview.com/article/2016/05/two-minute-eplainer-tunable-white-leds
2) http://www.glumac.com/circadian-lighting/

Friday, February 3, 2017

Designer lightings for Feb 2017 (Illuminating Asia Selection, Pendant Lights)

Ametista incasso by Catellani & Smith- We are intrigued by the shadow thrown on the wall and
the thought provoking center piece with a unique depth

Ametista tavolo by Catellani & Smith- See how the light creates a shadow that redefine a plain wall

CONTARDI LIGHTING Ongo
- Unique contemporary light piece with a subtle warm feeling


INGO MAURER Flatterby
- Fancy a light bulb that fits well in a garden?



WEVER & DUCRÉ WETRO 1.0
- Modern contemporary light piece, adding warmth to homes

Wednesday, February 1, 2017

Laser diodes - The next wave of LED lighting development?

Laser diodes to be the next LED lighting development - Is this possible and how feasible it is to our real life general lighting application?

Theoretically, if we place 2 mirrors on each side of the LED, the wide beam light throw effect from the LED will be forced to reflect internally within the 2 mirrors resulting in a more focused light beam.

This might mean that we need to create a light path for the LED in order to achieve the effect. This would be similar then to using fiber optic as a light guide.

All in all, can lasers replace LED Lighting? In my own opinion, i doubt so as general lighting requires a wide coverage at the lowest possible power input. Lasers will not be able to achieve an even wide coverage.



References:
https://qz.com/146761/forget-led-bulbs-the-future-of-interior-lighting-is-lasers/