Question about light in space?

I was reading somewhere that they made the first light antenna. I suppose
that would make it 100's of times quicker than radio signals.?
I know we have 100's of antenna's looking for readio signals from other
planets but do we have any looking for this type of signal already.
What if Aliens only ever used this type of signal or a simular type for
communication, has it
ever been tested for.?
If I were an intelligent being surely it would make sense using a technology
that is the speed of light rather than radio.

What are your views on the potential of this technology out of interest.?
How usefull is this compared with radio.?
Mick

PS Ive tried posting this question to sci.space.science but it just doent
show up. Why on earth would that be.?
I havent got a non-deliverable msg back.