During the past 20 years, the three primary lighting sources for signs have been fluorescent, neon and LEDs, but the relative ratio of each type has drastically changed. The industry trade journal, Signs of the Times, has tracked these changes over time via industry surveys.
The most recent such survey was published in ST‘s March 2015 edition. It notes that, in 2014, sign companies reported that LEDs were illuminating nearly 60% of all electric signs. In contrast, that figure had been only 14.7% in 2006. During that same time period, the percentages for fluorescent and neon dropped from 44.5% to 25.6%, and from 34.1% to 12.3%, respectively.
% Change in Lighting Type 2006 to 2014
The full report can be read in that magazine’s online, digital edition at the following link. http://www.nxtbook.com/nxtbooks/STMG/sott_201503/index.php#/76.