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CAUTION on removing blue tape on lights on AV.
Guys and gals, that tape is there for a reason and so is the hole. If you are planning strobe instals, I suggest you drill your own hole and dont take the shortcut of using the existing hole.
That hole is there to allow moisture buildup to escape. The tape over the hole is breathable tape. The tape is there to keep bugs and stuff out of your lights. In the long run, you will have mold mildew and other nasty corrosion set in your lights if you plug this hole with a strobe.
If you remove the tape, be prepared to pursuade a dirt dobber, wasp, bee, moth ..... to get out of your light!!! 
Just some advice for those planning on messin with the blue tape on the lights.
Wiki
Guys and gals, that tape is there for a reason and so is the hole. If you are planning strobe instals, I suggest you drill your own hole and dont take the shortcut of using the existing hole.
That hole is there to allow moisture buildup to escape. The tape over the hole is breathable tape. The tape is there to keep bugs and stuff out of your lights. In the long run, you will have mold mildew and other nasty corrosion set in your lights if you plug this hole with a strobe.

Just some advice for those planning on messin with the blue tape on the lights.
Wiki