Efficency
Watch This Guy Turn On A 20,000 Watt Light Bulb – Motherboard.
And I was impressed by the 400 watt light bulbs they used to have at SUNY Plattsburgh in the Conference Rooms. Even with Albany's pricey residential electricity, this light bulb would only set you back $3 an hour to operate -- assuming you had 166 amp line at 120 volts or 83 amp at 240 volts.
LED Lights That Mimic The Look Of Vintage Edison Bulbs – Architectural Digest.
I saw these at Lowe's the other day and thought they were quite novel. Not super cheap, but affordable for locations where the appearance of the bulb is a priority.
Watch This Neon Sign Master Make His Glowing Art
Interesting to watch about this dying vacuum-tube technology.
How Do Neon Lights Work?
Graphene’s Lightbulb Moment
Is this the next breakthrough on lighting and semi-conductor construction ?
Pest Problems
Then again, didn't most cities prior to the mid-1960s used be lit with mercury lamps, that are very blue (and give a ghastly light that makes everyone look like a ghost).