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Compact Fluorescent Light Bulbs > Twist / Spiral (Screw Base)

Twist (Medium Screw Base) Compact Fluorescent Light Bulbs
Medium / Standard
Twist (Candelabra Screw Base) Compact Fluorescent Light Bulbs
Candelabra
Twist (Intermediate Screw Base) Compact Fluorescent Light Bulbs
Intermediate
Twist (Mogul Screw Base) Compact Fluorescent Light Bulbs
Mogul

To determine which screw base you have, measure the distance across your base and follow the chart below to find your category:
Medium / Standard 26 mm (1 inch)
Candelabra 12 mm (1/2 inch)
Intermediate 17 mm (3/5 inch)
Mogul 39 mm (1 1/2 inch)