I have both my iPhone and desktop computer set to a "night light" mode, and obviously my eyes appreciate the warmer colors at night. But what I'm wondering is this: Do they actually work? Here's what got me thinking: I have a pair of Elvex glasses rated to block all blue wavelengths, and I have used a simple spectroscope to confirm that they indeed do. No blue light is transmitted. Another cheap pair of yellow glasses I have--while making everything look yellow--still transmit plenty of blue light when I use the spectroscope. So, are the LEDs built into our electronic devices not emitting the exact same wavelengths of light at all times, even though they may magnify warm colors more? Perhaps I have a misconception of just what is happening to the light source when my devices go 'warm'. Thanks to all.