Which specific wavelength does the hydrogen gas in the nebula glow intensely in, often targeted by astrophotographers?

Answer

Hydrogen-alpha ($ ext{H} ext{alpha}$)

Hydrogen gas in the nebula glows intensely in the deep red part of the spectrum, specifically at the Hydrogen-alpha ($ ext{H} ext{alpha}$) wavelength.

Which specific wavelength does the hydrogen gas in the nebula glow intensely in, often targeted by astrophotographers?
astronomynebulabrightnessNorth America Nebula