I suppose it's because HN is primarily about software startups, and the community heere seem mostly interested in growing software and online services companies quickly. Nothing wrong with that, but it would be very interesting to see a green entrepreneurial community with the same strong drive, to both help each other and make money sustainably.
Personally I am taking what I have learned from my software startups and starting sustainable food production at large scale next.
LED bulbs (Along with Knoll furniture) are part of that near future you saw in 2001 and all those other sci-fi movies.