Lighting-Gallery.net - My lights/First Generation Black Base Philips 18W SL lamp of very early construction
Philips | Streetlights
Philips SL*9 CFL with black base, early rare example of original CFL or energy saver design dating back to early 1980s, later lamps had a white base Stock Photo - Alamy
Philips SL*18 Demonstration Lamp
SON-T 150W E E40 SL/12 | 928487100096 | Philips lighting