Why does hydrogen look pink in a glow discharge

Why does hydrogen look pink in a glow discharge  

Consider a light bulb containing hydrogen gas at a low concentration of, say, 30 Pa (which is about 0.03 per cent of atmospheric pressure). A pale pink glow is seen when 

Photo-excitation of the hydrogen molecule leads to bond dissociation. 

The first excited state in the hydrogen molecule is an antibonding orbital. 

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