Regarding LEd

for a presentation on led, what info will u input there?
history of led, info of leds and lastly, latest technology
may i know what's the latest technology for leds now?

Given how long you have been on the forum I am suprised to see this favor of question.

Google. For the latest and greatest check the sites of the places that make them. They are sure to talk about the latest they have to offer. Use what you learn there to do more web searching. etc etc

it depends who you're giving the presentation to. engineers or technicians?

Technicians dont care who invented it, they just need to know how it works and how to configure it.

Engineers should know history, development, usages, and configuration.

whenever creating a presentation, always create it for the intended student.