I have a pair of Era 300s in my bedroom. While there is an option in the app to turn off the main indicator light, the only way to turn off the microphone (voice services) indicator light is to turn off the microphone.
Given that even dim lights can be annoying when sleeping (and the latest research suggest dark bedrooms are preferable), it would be good to be able to turn off the light via the app but keep the microphone on.