environmental
alternative
background
bright
bulb
concept
conceptual
conservation
eco
ecology
economy
efficiency
efficient
electric
electricity saving
energy
environment
field
fluorescent
friendly
grass
green
green energy
household
idea
improvement
lamp
light
lightbulb
low
luminosity
modern
natural
object
outdoor
pollution
power
renewable
resource
savings
source
spiral
supply
technology
watt
wattage
white