GE Lighting 75399 F40/25BX830/IS/WM 25W 3000K 4-Pin Biax Standard Bulb

What the product is and who it is for

The GE Lighting 75399 is a 25 watt compact fluorescent bulb with a 4-pin 2G11 base, designed for fixtures that accept single-tube Biax lamps. It delivers 2600 lumens at a warm 3000K colour temperature with an 82 CRI rating, making it suited for general indoor lighting where a warm white appearance is preferred. The 20000 hour average lifetime reduces replacement frequency in commercial or residential settings. Buyers needing a different base type, higher output or dimmable operation should consider other lamp families.

How it fits into a build

This lamp requires a compatible ballast and a fixture wired for the 2G11 4-pin socket; it cannot be used in standard screw-in sockets or with line-voltage wiring. The single T5 tube measures 21.5 inches, so the luminaire must provide enough length and the correct lamp-holder spacing. Because it operates at 25 watts, it draws less current than the 40 watt equivalent it replaces, freeing capacity on the lighting circuit for additional fixtures. Installations that lack a matching ballast or have restricted tube length will not accept this bulb.

Thermals, noise and power draw

In normal operation the lamp consumes 25 watts and runs at the lower heat levels typical of compact fluorescent technology, keeping fixture temperatures modest. The integrated ballast design avoids the audible hum sometimes associated with magnetic ballasts, so ambient noise remains low in quiet rooms. Power draw stays steady at the rated wattage throughout the 20000 hour rated life, providing predictable energy use without the inrush spikes seen in some older fluorescent systems.