a double ended 250 watt metal halide produces approximately 23,000 lumens (averaged out accross brands give or take a little) and has a spectral life of approximately 6 months.

Osram has developed a 1000 Lumen LED, that lasts for YEARS.

http://www.physorg.com/news93198212.html

maybe it won't be long before this little fella can be ours.