Fluorescent bulbs, which include linear, U-tube and circline fluorescent tubes, bug zappers, tanning bulbs, black lights, germicidal bulbs, high output bulbs, and cold-cathode fluorescent bulbs.    From Wordnik.com.  [Politics.ie] Reference

The contours of the lamp’s heat-molded diffuser act to enhance the brightness of the two low-watt circline fluorescent bulbs within while creating a compelling illumination that exaggerates the shadows on the design surface itself.    From Wordnik.com.  [Karim Rashid Unveils Beautiful Energy Efficient "Trex" Lamps | Inhabitat] Reference