Night lighting is a relatively new phenomenon in society: only in the 20th century did readily available electricity “illuminate” our days past the usual 14-16 hours to ones that could last for 24. This newfound freedom sparked a massive cultural shift, but it also came with a dark side: light pollution — too much light, where and when we don’t need it. Light pollution is proving to have far-reaching consequences, from health problems to the disruption of wildlife cycles. In this buying guide, you’ll see there are three factors to consider so you can create an effective and responsible exterior lighting plan.

http://www.hgtv.ca/outdoor/article/exterior-lighting-buying-guide/