Fluorescent Lamp is a gas-discharge lamp that uses electricity to excite mercury vapor. The lamp fixture is more costly because it requires a ballast to regulate the current through the lamp. It produces between three to five times more light than an incandescent lamp consuming the same electrical power and gives off significantly less heat.

Compact Screw Base Fluorescent Lamp: Standard Twist | Triple Tube | Reflector Flood | Globe | Bullet | Specialty | Pear / A-Line | Cold Cathode
Compact Pin Base Fluorescent Lamp: Single Tube 2-Pin | Single Tube 4-Pin | Double Tube 2-Pin | Double Tube 4-Pin | Triple Tube 2-Pin | Triple Tube 4-Pin
Straight / Linear Fluorescent Lamp: T2 | T4 | T5 | T6 | T8 | T9 | T10 | T12
U-Bend Fluorescent Lamp: T6 | T8 | T10 | T12 | T17
Circline Fluorescent Lamp: T5 | T6 | T9