Bynome 4Pin Light Bulb 2D Gr10q 4 pin 16w Cap Standard White (6500k) Bathroom Ceiling Compact Fluorescent Lamp,Energy Saving Lamp

【COMPATIBILITY CHECK】 Specifically designed with a GR10q 4-Pin square push-fit base. NOT compatible with 2-pin light fixtures or ballasts. Size: 13.3x13.3cm, dedicated replacement for 16W bulbs ONLY (Not for 28W/38W). 【SUPERIOR BRIGHTNESS】 Provides 1800 lumens of high-output 6500K daylight cool white illumination. Stable non-dimmable light output prevents dark spots, creating a bright and comfortable lighting environment. 【EXTERNAL BALLAST REQUIRED】 This is a Compact Fluorescent Lamp (CFL), NOT an LED bulb. It must operate with an external ballast to function. Advanced fluorescent technology ensures uniform distribution. 【ENERGY SAVING & LONG LIFE】 Consuming just 16 watts while delivering maximum brightness, this Energy Class A light bulb reduces electricity bills. Boasts an extended lifespan up to 10,000 hours. 【WIDE INDOOR APPLICATIONS】 Flat square DD butterfly bulb shape is ideal for flush ceiling lights. Perfect for residential and commercial spaces including bathrooms, kitchens, corridors, hallways, and stairwells, Manufacturer: Bynome