Blue light seems to reduce the amount of melatonin in the brain, so dimmed incandescent lights are better than fluorescents or LEDs.

Red LEDs obviously wouldn't fit the deprecated category. If my understanding is correct they are also good for providing illumination in situations where it is critical that you do not lose your night vision.

Programs like F.lux or Redshift can change the color temperature of your screen at night.

I have found F.lux useful and surprisingly unintrusive. Without playing conscious attention or turning it on and off to verify the difference is not noticeable. If you do go and turn it off after adapting to the altered display it actually feels unnaturally glaring.