bar
better
bill
bulb
calculator
certificate
chart
class
classification
conservation
consumption
cost
creative
curve
diagram
ecology
economical
economy
efficiency
efficient
electric
electrical
electricity
energy
environment
equipment
eu
fluorescent
graph
green
home
idea
illustration
label
lamp
led
level
light
lightbulb
performance
power
rate
rating
regulation
right
save
tech
usage
utility
watt
定額
Energy efficiency concept with energy rating chart and LED lampの素材 [FY31098444183]
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