What is the green stuff inside my round light on the ceiling

[bbabythai]

I have been renovating a building for ages and a few months ago the electrician installed a round light above the stair case on the top floor. I noticed theres

some green looking dust or whatever inside the cover. Does anyone know what is causing this?

 

Above that ceiling is a concrete floor where the water tanks are. A month ago one of the tanks did overflow and water was on the ground. Can I assume that some water somehow made its way into that light fitting? Its only happened once. 

 

Or is it something electrical?

 

thanks

[petermik]

dirty water has found it,s way in...hence the green colour

[AlfHuy]

Be careful.

[AlfHuy]

Or maybe something strange growing in there.

Pickles are on the rise. 

Since no tourists are allowed in, they enter the country illegally .

[worgeordie]

Algae, if there is water in there it's going to increase,

and give your light a nice green glow, ,,,get it cleaned.

 

regards Worgeordie 

 

 

 

[RJRS1301]

It is a worry when water overflows meet electrical fittings. 

Heat, moisture and mildew, and who knows what other life form is growing there.

 

[Dumbastheycome]

Looks like algae and mold.

You could maybe add  more water and a couple of those little algae eating fish and declare it a novel lighting feature?

 

[ThailandRyan]

It looks like green spore mold.  Pretty bad in reality, as it could spread if the spores manage to blow onto other items.

https://www.mouldfacts.ca/mold-types-commonly-found-in-homes-and-offices/green-mold.html

[NCC1701A]

China virus petri dish. 

 

I would wear a mask when you clean that.

 

https://en.wikipedia.org/wiki/Petri_dish