Keystone KT-LED10T8-48G-840-E 10W, 1800 Lumen, 4' 220' Beam Angle, Type C Driver Required

It needs a driver. The KT-LED10T8-48G-840-E is an external drive lamp and requires a Keystone Type C driver to operate. There is no onboard driver, so it will not run direct wire to line voltage and it will not work on an existing fluorescent ballast. Order the matching Type C driver along with the lamps or you will have fixtures you cannot energize.

Not as a simple tube swap. This is a Type C lamp, meaning it runs off a remote LED driver, so the fixture has to be rewired and the fluorescent ballast removed or bypassed with the Keystone Type C driver installed in its place. If you want a lamp that drops straight into existing sockets with the ballast left alone, you want a Type A ballast-compatible tube instead, not this one.

The lamp system is rated 120 to 277 volts, so it covers both the 120V branch circuits typical of smaller buildings and the 277V lighting circuits common in commercial and institutional facilities. One part number works across both, which is what you want when you are standardizing troffers across a campus or a multi-tenant property.

10 watts for 1800 lumens on a 4 foot lamp. For a maintenance buyer swapping out fluorescent T8 troffers, that is a meaningful drop in connected load per lamp while keeping usable output for office, corridor and back-of-house spaces. Remember the driver is separate and sits outside the lamp.

KT-LED10T8-48G-840-E. That is the full Keystone manufacturer part number for the 10 watt, 1800 lumen, 4 foot, 220 degree Type C tube. Pair it on the purchase order with the Keystone Type C driver, since the lamp will not operate on its own.

220 degrees. That is a wide distribution for a tube lamp, so light wraps well beyond straight down and fills the reflector of an open troffer or strip fixture rather than throwing a narrow stripe on the floor. In a wraparound or enclosed lens fixture it gives you even brightness across the diffuser.

Rated at 50,000 hours. For an MRO or facilities buyer running the math, a fixture burning roughly 12 hours a day, 5 days a week lands near the 16 year mark at that figure, which is why these get specified in buildings where ladder time and lift rental drive the real cost of a lamp change.