It is simply by minimizing handling. It doesn't only apply to heat lamps but all other categories of reptile heaters. Reptile heaters that get moved or vibrated wear out quickly. So to avoid this, make sure that the heater isn't moved or unfixed regularly. That is why you must always clean your enclosure very well before fixing any heater to it, especially under tank heat pads. Another way to get the best from heat lamps or bulbs is to use them with a quality ceramic socket, not a plastic socket. To ensure that your heat bulbs give your skinks the best heat, where you have the bulb screws in at the center, you must have good contact with the bulb.