Use this to compare the cost of different kinds of light bulbs. Move the HOURS slider to set the number of hours the light bulb lasts. Move the PRICE slider to set the price for buying each bulb. Move the WATTS slider to set the amount of electricity the bulb uses. For example, LED bulbs last 12,000 hours, cost $4 and use 9 watts. The bar shows the cost of bulbs (dark blue) and the cost of electricity (light blue).
