Does the subject of LED lighting ever get brought up in your classes?
No, we use 5mm leds every now and then as an example light source, that is as far as it goes.
And I made an array of colour leds from 630nm to 400nm for demonstration of the photo-electric effect (the ability of photons to free electrons out of certain alloys). But that has nothing to do with lighting.
But light efficiency, colour temperature, CRI etc. is not a subject at school.
So your students have no idea what you do in your leisure time? 
:laughing: you made it sounds…. (can’t find the right appropriate words)
[Clemence]
The reason I ask is that when in secondary school someone would ask the science teacher a question like how is a nuclear bomb made and for the rest of the lesson we learnt very little except how a bomb was made. 
Not a clue. 12-18 year olds on average hardly wonder what goes on in other people, let go showing interest in people older than themselves. But there are a few exceptions Most student like me and if they notice it at all, they appreciate what I’m doing at school (assisting anything to do with practical work and experiments in the science subjects), but what I do in my spare time is well beyond their universe.
I had this moment too, but worse. In my 2nd senior high school, there was a time when a physic class teacher answered a question from my friend. He explained how rainbow made colors out from white sunlight. He did something so very stupid in my opinion as an 16 y.o student. He could explain a nature phenomenon but failed to understand the basic.
Student: “Sir, if rainbow came from white light then is it possible to combine those colors back to white?”
Teacher: “Of course we can with the help of a prism”
Student: “I tried mixing all primary water color pigments but it didn’t work, why is that?”
Teacher: “You have to be extremely accurate, a slight mistake won’t make it white”
Me: :person_facepalming: :person_facepalming: :person_facepalming: :person_facepalming: :person_facepalming:
I got dumped (for being a constant brat) to this “lower grade” high school, and then I realized all the teachers were also (mostly) “lower grades”. My physics teacher in the former high school taught me that pigment color mixing is totally different from light mixing. I believe him because he demonstrated the difference in front of us. I’m sure Djozz also does this too.
I was a little doubtful Thomas with sharp tongue back then, only proofs could silent me.
[Clemence]
Reminds me of a 4th grade exam question that i failed related to the mixing of all colors, i said white based upon light (sunlight and rainbows), but they were looking for black or brown based upon the reflection of light (mixing of paints).
Funny how you can’t remember any of the questions that you answered correctly, but the failed answers stick forever in your memory.