This Electrolier exit sign had no diffuser when I found it. Later I grabbed some pieces of silver-coloured fluorescent diffuser that were just the right width. I cut a part and put it over the opening, voila!
My exit signs have slits on the bottom instead of a diffuser. I kinda miss the downlight found in these older exit signs, I've yet to see a LED exit sign with the classic downlight that the incandescent and fluorescent signs had.
Do they still make CFL exit signs? My elementary shoolhad them. I always thought it was cool to see them strobe when the lamps were dead. The same when the F40T12 lamps were on their way out.
yep those would be the PL lamps usually 9W,ballast is usually in the top of the fixture