The scope of 5m is shown exaggerated u. With a 85mm f1.4 closed 4.5, I have to get on and stay 500iso to 1 / 100th of a second to expose a subject placed 2m with 1IL sub exposure. Despite their numbers these LEDs are very powerful, and 126 are hardly better than 3 LED flash Samsung Galaxy S3 ... Advantage against, wider distribution, fixation on ISO flash shoe and heats much less.