Incandescent vs. LED

The new's are not as good as they appear compared to the old's, beside the often trap in the economic problem of vendor-lock-in or technology obsolescence.

Attach to your computer screens and smartphone at night? This photobiology expert has a lot to tell you about LED lighting.

In Europe, the historic architectural details sway the lights to be directed at the building ornaments instead of targeting the open space or people on the streets. European cities also generally understand how diffusion works for creating ambiance. They are aware light bounced back from beautiful architectures or even a wall creates a better ambiance.

North America is a totally different story. Most of the new high intensity LEDs have no diffusers and are oriented to glare directly to people's or passersby, as if they are meant to deter people.

Look around the Merchandise building and one will find the same situation. The angle of the lights are directly aim at the pedestrians.

The smartphone device adds to the daily exposure.

"Blue light at the wrong time can disrupt sleep by suppressing production of the sleep-inducing hormone melatonin."

"And in Canada, public outcry over the city of Montreal's $84 million plan to replace existing streetlights with LEDs centered on light polution and health impact."