The Phoebus cartel isn't comparable, because incandescent lamps have an inherent tradeoff between lifespan and efficiency. Most of the output of an incandescent

The Phoebus cartel isn't comparable, because incandescent lamps have an inherent tradeoff between lifespan and efficiency. Most of the output of an incandescent lamp is infrared. Running it hotter shifts it more into the visible spectrum, increasing lumens per watt, but also makes the filament fail sooner. It's easier to sell long-life lamps than high-efficiency lamps (bulb failures are obvious, but few people had the test equipment to measure efficiency of individual bulbs). The cartel avoided competition on lifespan that would have wasted a lot of electricity.