Street light abd illumination problem

Question

I know the answer isn't 2.12 meters

A streetlight contains two identical bulbs 3.3 m above the ground. If the community wants to save electrical energy by removing one bulb, how far from the ground should the streetlight be positioned to have the same illumination on the ground under the lamp?

____m

Answer 1

Remove all the streetlights and issue the community LED torches with the money saved.

Answer 2

x = (3.3)/sqrt(2) =2.35 m