This is especially true in saltwater, as any cover over an underwater bulb will encourage aquatic growth accumulation.
The cage is not necessary in most dock light applications, but is available for customers that are concerned with the bulb contacting rocks or other solid objects in rocky areas.
This cage is designed as an added barrier against bulb breakage, but in no way guarantees that the bulb will not be damaged if struck with enough force.
The most important factor in protecting your bulb is keeping it out of the way of boat propellers. With very few exceptions, this is the only cause of broken bulbs.
