The document discusses a study by the US Department of Energy comparing the energy efficiency and environmental impact of incandescent bulbs, compact fluorescent bulbs (CFLs), and light emitting diode (LED) bulbs. The study found that LED bulbs use the least amount of energy during their lifetime and have the lowest environmental impact overall compared to incandescent and CFL bulbs. Philips, a lighting company, is working to develop more sustainable lighting solutions like algae-powered bioluminescent lighting and eco-designed products as part of its Luminesce initiative.