@Max, why not just dip the LED into acetone, which would soften the plastic, and press it against a cloth or something to roughen the exterior? It will diffuse the light quite nicely, I should imagine.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.