bio
black
bright
brightly
bulb
concept
conservation
conserve
creative
eco
ecology
economical
efficiency
electric
electricity
energy
environment
equipment
fluorescent
fuel
generation
glowing
green
hand
holding
idea
illuminated
illumination
incandescent
innovation
inspiration
invention
lamp
leaf
lit
natural
nature
plant
power
recycle
save
saver
savings
shape
solution
technology
tungsten