Side-by-Side Comparison
Indoor Climate & Fixtures
Ceiling Fans vs. Light Bulb Bases
Comparing 2 standards across 16 specifications. 16 key differences identified.
Comparing:
Ceiling Fans
Light Bulb Bases
Ceiling fan blade spans standardize to room square footage: 36" for small rooms (<75 sq ft), 42–44" for bedrooms (75–144 sq ft), 52–54" for living rooms (144–225 sq ft), and 60"+ for great rooms, requiring a minimum 7-foot blade floor clearance.
Domestic light bulb bases standardize screw (Edison) and pin configurations. The E26 (26 mm) base serves as the standard medium screw in 120V North America, E27 (27 mm) in 230V Europe, E12 (12 mm) for candelabras, and GU10 for 120V/230V twist-lock track spotlights.
Specification Comparison Table
16 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
ENERGY STAR Ceiling Fan Standards / ALA Sizing Formulas | IEC 60061 / ANSI C81.61 (Electric Lamp Bases) |
|
Small Room Span (<75 sq ft)
|
29 to 36 inches (74–91 cm) | Bathrooms, breakfast nooks, utility rooms | — |
|
Medium Bedroom (75–144 sq ft)
|
42 to 44 inches (107–112 cm) | Standard secondary bedrooms, home offices | — |
|
Standard Living Room (144–225 sq ft)
|
52 to 54 inches (132–137 cm) | Master bedrooms, family rooms (Universal standard) | — |
|
Great Room Span (>225–400 sq ft)
|
60 to 72+ inches (152–183+ cm) | Open-concept living areas, vaulted rooms | — |
|
Minimum Floor Clearance
|
7.0 feet (2.13 m) from floor to fan blade tips (Building Code requirement) | — |
|
Optimal Airflow Clearance
|
8.0 to 9.0 feet (2.44–2.74 m) from floor to fan blades | — |
|
Downrod Length Formula
|
(Ceiling Height in Feet–9 Feet) × 12 = Downrod Length in Inches (e.g. 10 ft ceiling = 12" rod) | — |
|
E26 Medium Edison Screw
|
— | 26 mm (1.02") diameter | Standard North American residential lamp base (120V) |
|
E27 Medium Edison Screw
|
— | 27 mm (1.06") diameter | Standard European/International residential base (230V) |
|
E12 Candelabra Screw
|
— | 12 mm (0.47") diameter | US chandeliers, nightlights, sconces, holiday bulbs |
|
E14 Small Edison Screw (SES)
|
— | 14 mm (0.55") diameter | European candelabra and small accent fixture standard |
|
E39 / E40 Mogul Screw
|
— | 39 mm (US) / 40 mm (EU) | High-wattage commercial & industrial fixtures |
|
GU10 Bi-Pin Twist-Lock
|
— | 10 mm pin spacing with mushroom feet | 120V/230V mains voltage spotlights |
|
G9 Looped Bi-Pin
|
— | 9 mm looped pin spacing | 120V/230V compact halogen/LED capsules |
|
MR16 (GU5.3)
|
— | 5.3 mm pin spacing | 12V low-voltage directional spotlight base |