This is a 48-inch T12 linear fluorescent tube rated 60 watts and 4,100K cool white, with a recessed double contact (R17d) base. It is a high-output lamp, so it runs brighter than standard-output tubes of the same length and needs a ballast that supports HO lamps. Philips' ALTO designation means low-mercury construction. It suits owners replacing a failed tube in shop lights, garages and commercial fixtures that already take R17d high-output lamps; it is not a plug-and-play swap for a standard bi-pin fixture.
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This Philips fluorescent tube is a 48-inch T12 lamp rated at 60 watts. It is a high output lamp from the ALTO line and produces Cool White light at 4,100K.
It uses a Recessed Double Contact (R17d) base.
