Need to replace the bulb in a specific lamp or fixture? This 4-pack is for the F16T4 fluorescent tube. It's 17 inches long including the pins (about 16.5 inches of just glass), with a T4 thickness, 16 watts, and a warm white color temperature of 3000K. It uses a G5 bi-pin base. These are common replacement bulbs for certain desk lamps, under-cabinet lights, or commercial fixtures. Specifically, they fit models like the Westek 20125-FA200WBC and various Furnlite lamps (FC-952, FC-953, etc.). Always double-check your old bulb's specs! They provide decent brightness (around 860 lumens) and have a long lifespan. Easy to install – just line up the pins and push in. A cost-effective way to keep your lighting working. The bulbs are fragile, so handle with care during installation.