My periodic table poster is now available! 2 watt compact fluorescent bulb. This is the cutest little bulb, just one twist, two watts of light. Europium is used in the phosphors. Source: Bulb Americal Contributor: Theodore Gray Acquired: 11 March, 2009 Text Updated: 17 March, 2009 Price: $5 Size: 2" Purity: <1% Sample Group: Light Bulbs