There is a whole lot of online retailer on the website such as ledmyplace.com & 1000bulbs.com, don't know which will be best. Which is the best long lasting led bulb brand in the USA.
Unfortunately, this question is difficult to answer because it is highly subjective and depends on various factors. It is best to research different brands and products to find the best one for your specific needs. Some popular brands for LED emergency lights and exit signs include Energetic Lighting, Lumecon, and Exitronix.