Light-emitting diode or LED lights.
These small glowlights use only a tiny amount of power.
Bulbs are newer items and are for sale in this display.
LEDs first came on the scene to illuminate readouts and dials or to show that an appliance was on. Diodes abound in electronics and these products exploit their lighting properties and white light has been an advancement.
Technical data exists about developments but, for example, the lights are of some use for interior lighting for a camper van that is dependent on solar or a genny when travelling away on remote adventures. LEDs are used in traffic lights.
Saw the light at Cetnaj P/L Mayfield West.