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Concept Efficiency Lighting Comparison (37)
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Energy Efficiency Co...
Energy Saving Concep...
Old New
Energy Saving Bulbs ...
Concept Efficiency L...
Led Lamp Energy Effi...
Hands Compared Incan...
Hands Compared Incan...
Energy Efficiency Li...
Light Bulb Energy Ef...
Different Bulbs Fall...
Different Bulbs Fall...
Different Bulbs Fall...
Different Bulbs Fall...
Different Bulbs Fall...
Different Bulbs Fall...
Two Light Bulbs Diff...
Two White Light Bulb...
Choice Ecology Energ...
Incandescent Light B...
Incandescent Light B...
Comparing Filament F...
Burnt Dirty Led
Writing Displaying T...
Various Types Light ...
Teacher Showing Inca...
Student Showing Inca...
Student Showing Inca...
Teacher Showing Inca...
Student Showing Inca...
Unrecognizable Femal...
Students Showing Inc...
Teacher Showing Inca...
Led Flashlight Power...
Led Flashlight Power...
Concept Old Contrast...
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