Against Blue Light
To protect yourself from blue light, use dim red lights. Red light compared to the other colors in the spectrum are the weakest, while blue is the strongest.
Use lighting with 3000 Kelvin color temperature or below. You can look at the light’s packaging for its color temperature. The light’s temperature is a measurement of lighting. Since blue light can simulate daylight and has the most strength, it easily brightens the night sky. The higher the color temperature the more blue it has. Therefore, use warmer lights (3000K or less) because they have the least effect on the night sky.
You can use blue blocking glasses when using electronic devices with screens. Apps such as F.lux, Lux, twilight, and night shift (iOS) filters out blue light from the screen come nighttime. This helps protect you from some sources of blue light.
IDA Seal of Approval
When buying new lights check if the packaging has the international dark sky fixture seal of approval. This ensures that the bulb is dark sky friendly.