It's unlikely that 1000 year bulbs would actually be useful for 1000 years. Just as incandescents are being replaced for sake of energy efficiency. And I find

It's unlikely that 1000 year bulbs would actually be useful for 1000 years. Just as incandescents are being replaced for sake of energy efficiency. And I find it hard to imagine any economic system that could efficiently build 1000 year bulbs. It requires spinning up factories for a short period of high volume, mass production, followed by a long, low volume trailoff. That's a costly and wasteful process under any economic system. Our limited time and money is better spent solving more immediate problems, methinks.