alternative
background
bright
bulb
clear
compact
conservation
critical
currency
detail
eco
ecology
economic
economical
efficiency
electric
electrical
electricity
energy
environment
equipment
flourescent
fluorescent
glass
hand
idea
illuminated
illumination
innovation
invention
kilowatt
lamp
light
lightbulb
lucent
modern
object
polarity
power
powerful
save
saver
spiral
technology
think
tornado
twist
utility
watt
white