How do you measure the life of a light source that could last decades? (Photo: Shutterstock)
Compact fluorescent light bulbs are often criticized for being dim and slow to warm up (Photo: Mathew Bajoras)
An Integrating or Ulbricht sphere used for photometric testing of lamps and light fittings (Photo: Gamma Scientific)
Switch Lighting's 60-W incandescent-replacement LED light bulb is filled with liquid silicone to draw heat away from the LEDs
Just over a week ago we reported that Philips' 22 W LED light bulb, designed as a like-for-like replacement of a 100-W incandescent light bulb, was the first LED bulb of its type to receive the stamp of approval from Energy Star. But looking at the Energy Star requirements reported by Philips in its press release, it seemed a little strange that Philips' product is the only one to have been certified – given that products long on the market appear, at face value, to meet those requirements. Since then, Gizmag has spoken to LED light bulb makers Switch Lighting and other industry players to find out why they're apparently playing catch-up.
Other Images from this Gallery