IESNA paper #57: will leds transform traffic signals as they did exit signs?

摘要

Whenever a new light source eneters the lighting market,liminaire mana=ufacturers and potential purchaeers of proudcts tha towuld use the liht sorce need time to find the "best bets" in terms of apliction,design,efficiency and economy.We obseve that the recent strong entry of light-emittign diodes (LEDs) into th etraffic signal market in some ways repeate the sam developmental patterns we witnessed for the emergence of LED exit ssignes,In this updat we explore briefly several technical and eocnomic questions: Will LED traffic signals be as successful in transforming hte traffic signal marktet as they wre in transforming the exit sign makret? Whtat brrriers woudl delay orgress? will THis pattern prove probust enough ot be prepeated for othe lighting applicatiosn,such a soutdoor or indoor illumination?