read it! many cities have been using new bulbs in traffic lights. these new bulbs are saving money. the new…

read it! many cities have been using new bulbs in traffic lights. these new bulbs are saving money. the new bulbs last longer, and they use less power. the old bulbs used a lot of power. they also needed to be changed every year. the new bulbs last up to seven years. they do not need to be replaced as often. do it! over time, the new bulbs are _______. a brighter b safer c warmer d cheaper

Answer