Light Emitting Diodes are some wizard-level technology imo.
@Momentrabbit @starkatt They're much tastier before you've blown all the magic smoke out of them, I'll say that much. xvx
@starkatt Semiconductors are in that area of advanced physics that doesn't really make all that much sense even after you've mastered the concepts.
@starkatt Light Emitting Resistors, meanwhile, are standard apprentice training.