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  • Please does anyone know what fluorescent tube I need to replace this Osram 54w/535 f838? Staff in shop don’t know either! All completely different numbering.

  • You need to know the length of the tube and the diameter of it. Making the assumption it's for a general hallway/bathroom/kitchen/office it's likely to be a 6ft T8 or T12.

    T8 tubes are 1" diameter and T12 are 1.5"

  • Osram 54w/535 f838?

    54Watts
    Length excluding pins 1149 mm
    G5 connection pins 5mm centre to centre
    tube dia 16mm

  • does anyone know what fluorescent tube I need

    My policy is to not replace fluorescent tubes except in very narrow specific cases. It's nearly always better in the long run to replace the whole fitting with an LED substitute now. If your electrician doesn't immediately suggest this, lead him in that direction.

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