Instruct: Classify a given Amazon review as either positive or negative.
Query: Short Life

These bulbs are very expensive and very short lived. Unfortunately it is almost impossible to find a cheaper replacement with the same amp and watt rating. You are hooked into buying these bulbs for your itty bitty if you want the same brightness. These bulbs progressively darken as the tungsten is burned off the filament and deposited on the bulb surface, so the light begins a dimming process almost immediately. This whole system from Zelco needs reengineering. Beware!