| Found these online...
TL-A Aard = Earth - external earthed metal stripe
TL-B Special 40W tube for cold atmospheres (obsolete)
TL-C DC operation in ships, trains etc (obsolete)
TL-D Dunn = Thin - i.e. the slim T8 tubes
TL-E Circular tube
TL-F ReFlector
TL-H High temperature use, i.e. an Amalgam tube
TL-K Kracht = Strong, basically a highly loaded tube
TL-M Magnetic Instant-Start ballast
TL-R Relay-start system, using tungsten ballast lamps (obsolete)
TL-S Starterless design, with internal metal stripe
TL-U U-shaped tube
TL-W W-shaped tube (obsolete)
TL-X for use in explosion-proof fixtures, single pin cap
TL-5 5/8" / 16mm diameter tube.
In 1981 Philips launched the first compact fluorescents. This was viewed as
a new product family, unique to Philips, so the T was substituted for a "P"
simply to emphasise that it was originally a Philips innovation. e.g:
PL-S Single U-tube
PL-C "Cluster" or double U-tube
PL-T Triple U-tube
PL-H High Output 65-120W types
PL-L Long U
PL-Q 2D shaped flat lamp
Following this the self-ballasted CFLs were launched. The various types
were sold under the group name "SL".
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