LED Bulbs Models and sizes:
A19/A21: Standard household bulbs (A stands for shape, and the number is the diameter).
BR30/BR40: Short reflector (for downlights/ceiling lights, the number is the diameter).
PAR20/PAR38: Parabolic reflector (strong light focusing, used for spotlights/outdoor lighting).
MR16/GU10: Low voltage/high voltage pin type (track lights, cabinet lights).
LED Bulbs
Interface type (lamp holder): E26/E27: Standard screw interface (North American E26, European E27). GU5.3/GU10: Double pin bayonet (GU5.3 is 12V low voltage, GU10 is 220V high voltage). B22: Bayonet type (common in Commonwealth countries). Color temperature Warm white (2700K–3000K): comfortable yellow light (suitable for living rooms). Cool White (4000K–4500K): Neutral white light (offices, kitchens). Daylight (5000K–6500K): Bright blue-tinted light (task lighting). Dimmability: Check if the LED is compatible with dimmer switches (not all LEDs are). Smart Features: Wi-Fi/Bluetooth-enabled bulbs for app control, scheduling, and color changes. Applications Residential: Ambient, task, and accent lighting. Commercial: Office spaces, retail stores, and streetlights. Automotive: Headlights, brake lights, and interior lighting. Professional: Grow lights, UV LEDs for germicidal applications.