I'm trying to answer 2 questions mainly:

 1. What kinds of data are generated from 1 branch of IoT devices namely smart bulbs/smart lighting? 
 2. How can we visualize the data generated by the same?
 

I searched online specifically on the same but could not find a lot of useful information. If any of you could help answer this question with relevant resource URLs, it would greatly help me for a school presentation on the same.