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Ubiquitous in stores and offices, fluorescent light tubes may be energy-efficient, but their innards are toxic. The EverLED tube contains no mercury or lead. It also lasts up to five times as long and uses 25 percent less power than fluorescents. Since LEDs work at low voltages and existing fluorescent fixtures deliver huge spikes of electricity, engineers built circuitry into the tubes that analyzes and adjusts the voltage accordingly. $150 per bulb; leddynamics.com
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