Does anyone know???

[envelope_man]

hey everyone, I'm in need of a plastic grid(panal) 1/2" x 1/2", 16" x 48". don't know what this stuff is called. and my description is not to good I'm sure!!! Ive seen this stuff in a few videos & aquariums....used as dividers & supports for light units over top of tanks. does anyone know where I can buy a sheet of this???
thanks!

[Plato]

Eggcrate at Lowes and Home Depot in lighting section.

[envelope_man]

thanks, I never would have thought to look in the lighting section!!!

[LAKEM0NSTER]

Aka light diffuser