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JohnHerer Reviewed by JohnHerer on . Light bulb question Whats the difference? Spiral Compact Fluorescent Light Bulb Medium Base, 24 Watts, 120 Volts, 1500 Lumens Long Life 10,000 Hours, 6500K Daylight Color Tone 5.70" Maximum Overall Length Spiral Compact Fluorescent Light Bulb Medium Base, 20 Watts, 120 Volts, 1250 Lumens Long Life 10,000 Hours, 6500K Daylight Color Tone Rating: 5