Smoke alarms with lights

[dst]

Has anyone got any thoughts in these. Are they suitable for holiday lets?

Edited March 19, 2023 by dst
typo

[AnthonyB]

They usually only illuminate on alarm and not power failure and usually wouldn't put out the right light output in the right places, but if it's a property where guidance wouldn't require normal emergency lighting and would accept torches then they may be a useful supplement