Exact Fit Compatibility: 27W GX10Q-4 4-Pin CFL Bulb – Designed for fixtures that specifically use the CFML27W / GX10Q-4 base. Please verify your lamp socket before ordering to ensure proper fit Easy Plug-In Installation: Simple push-in 4-pin design allows fast bulb replacement without tools or rewiring—just remove the old GX10Q-4 bulb and plug in the new one Bright 6500K Daylight Illumination: 6500K daylight white light provides clear, crisp visibility ideal for reading, crafting, stitching, salon work, and precision tasks, reducing eye strain during long sessions Requires a Working Ballast: This is a CFL fluorescent tube and requires a working electronic ballast in your lamp. The bulb will not turn on if the lamp’s ballast is worn out or faulty Long-Life Energy-Saving Lamp: Up to 10,000-hour lifespan with low heat output and stable brightness—an efficient replacement for CFML27W compact fluorescent lamps used in task lighting High Lumen Output for Task Lighting: Provides bright, wide light coverage that enhances visibility for detailed work such as sewing, electronics, beauty treatments, and other close-up activities. Multi-Purpose Use at Home or Office – Ideal for desk lamps, magnifying lamps, hobby workstations, and reading lights that use GX10Q-4 27W CFL bulbs. ARSUK 27-Watt Replacement bulbs produce near daylight quality light which reduces eye strain and improves concentration time. Daylight 6500k is great for handling smaller tasks that require long spans of concentration as it keeps you alert, unlike neutral color temperatures, which are more for general purpose lighting. ARSUK Energy-saving replacement bulb also known as reading lamp 27w or daylight GX10Q-4 cap socket compact fluorescent lamp. These compact fluorescents are used for high-vision reading desk lamps, floor lamps, or daylight task lamps. The High vision reading light is specially designed using near daylight bulbs to give the perfect light for reading, hobbies, study, or close work.