Any reef tank can benefit from removing the splash guard. Of course it's a trade off. The closer the fixture is to the water, the more exposed it is to salt spray. Fixtures with internal power supplies get extra hot and need fan cooling. (The best fixtures have external/inline power supplies.)
What is clearly evident in the pic above is how hot that light has been running and how close it came to catching on fire. Perhaps there is a cooling fan that has stopped working? No worries. Just eliminate the splash guard and if possible, remove the fan.
Removing a nonworking fan eliminates a part that has been adding extra heat. It is still connected to power so the motor gets hot, but since the fan isn't turning it mostly just heats up the fixture. These two modifications allow convection cooling, in other words, cooler air enters the underside and hot air exits the topside.
Of course, all of this is trouble we don't worry about with the top of the line brand new Aqua Illumination LED lights we can get for almost half price from Boxfish here in the WMAS.
Aloha,
Mark