The spectrum difference indicates that the cold bulb has been changed out for an LED model. The others most likely will be changed out as well as they fail.
That's because you weren't in dumb kid math. As a kid I was a seen as a trouble maker and put in dumb kid math. That was the best math class I ever took. They taught us how to balance a check book, how our taxes worked, interest rates and apr for loans and credit cards. I don't know why this wouldn't be a mandatory class for everyone. And maybe some of the skills like balancing a check book are outdated and that's fine. Update them with something more relevant now like how to read a contract or something.
They should exist, but we are not utilizing them correctly. Once someone has reached a billion dollar networth then they are thrown a big party and then sacrificed to a valcono. I believe this would curb emissions and fix climate change.
Not compared to other bulbs.