background
black
bright
bulb
clear
conceptual
conservation
dark
darkness
efficiency
electric
electrical
electricity
energy
equipment
filament
fluorescent
glass
glow
glowing
idea
illuminate
illuminating
innovate
innovation
isolated
kilowatt
lamp
light
light bulb
lighting
lit
luminosity
modern
object
power
reflective
shadow
side
symbol
technology
transparent
watt
wire
yellow