The diameter is 115mm.
As long as it can fit and you can secure the light with the screws provided, that would be safe.
We do not recommend that, but you could possibly use the stake to keep the lights securely in place.
Yes, you would just need to tap the light until it turned off.
The on/off button is underneath the light.
You could possibly just place the lights on the artificial grass bu these units come with a spike and a screw pack.
I am afraid not.
It is between 10-12 Lumens.
These will be able to light the way on the decking and will stop any stumbles!
The height of the Tap Dance is 3.5 cm