Energy weapons and anclave power armours have lots of glowing parts. I know, that enabled pip-boy light can betray your presence. Does this also apply to glowing equipment elements?

Also, how loud energy weapons are? What is better to silent death - energy weapons or silenced guns?

I'm pretty sure that glowing armor like the Enclave Remnant's Armor does not affect your Sneak.

For silent kills, I would suggest Silenced Weapons to Energy Weapons. Try to find some good mods that could help.