It says less tha 6mA standby, plus operating the relay
The ones you gave the link to are momentary, which means the light only stays on when you hold the button down, I would have thought latching would have suited better, unless you only want the light on for a short time like walking along a short path.
Yes, you're right they are momentary. Therefore I've developed an 555 circuit to go to constant. I will put button like manual switch on the wall, so the light will be remotely and/or manually controlled thus way.