U.S. Voltage & Power Standards
Before selecting a base, verify the electrical supply of the fixture. Residential, landscape, and industrial applications in the USA utilize three distinct voltage tiers.
The standard for American homes. Powers E26 bulbs, GU10 track lights, and integrated LED ceiling fixtures.
Requires a transformer. Primary standard for MR16 track lighting, under-cabinet pucks, and landscape path lights.
Common in US warehouses and office troffers. Essential for T8 linear tubes and high-bay warehouse LED retrofits.
Professional Base Directory
Click any base below to browse our specific collection of LED replacements.
The "Universal" US standard for lamps and ceiling fixtures. Size of a US quarter.
Small diameter screw base for chandeliers and foyers. Size of a pinky nail.
Two thick pins that twist into track lighting and recessed can "gimbals."
Two thin pins. Requires a 12V transformer. Standard for landscape and premium track light.
Standard base for T8 and T12 linear tubes. Used in commercial troffers and garages.
Extra-large screw base for high-output warehouse and parking lot corn lamps.
U.S. Shape & Size Matrix
Identify your bulb's shape and diameter code (Diameter in 1/8ths of an inch). Use the links below to shop the exact profile.
| Shape Profile | US Diameter | Typical Voltage | Action |
|---|---|---|---|
| A19 (Standard Pear) | 2.375" | 120V | Shop A19 |
| B10 / CA10 (Bullet) | 1.25" | 120V | Shop B10 |
| G25 (Vanity Globe) | 3.125" | 120V | Shop G25 |
| BR30 (Indoor Flood) | 3.75" | 120V | Shop BR30 |
| PAR38 (Outdoor Flood) | 4.75" | 120V | Shop PAR38 |
| T8 (1" Linear Tube) | 1.0" | 120-277V | Shop T8 |
| MR16 (Track Spot) | 2.0" | 12V / 120V | Shop MR16 |