Your search for "ultra small led" revealed the following:

Superfine cord, outer diameter approx. 0.38mm, yellow : Sakatsu material, Non-scale 4512

Gourd Rail for Mini Mini Train : Yoshiaki Ishikawa Railway Track 9mm Gauge N(1:150)

Miniatuart mini [Light house and canal boat] : Sankei Kit Non-scale MP05-08

Light diffusing diffuser film: BitTradeOne Material: Non-scale MMDFSF

Self-propelled mini mini train with built-in battery : Yoshiaki Ishikawa Finished product N (1:150)

Aurora Christmas : Kumi Chikada - painted, Non-scale

Acrylic 5 mm square bar, 4 pieces : Koeido Material, Non-scale AB-5S

Kakukaku Rail for Mini Mini Train Compatible with Daiso Case (20x10cm) : Yoshiaki Ishikawa Railroad Track 9mm Gauge N(1:150)

Square 100 Rail for Mini Mini Train : Yoshiaki Ishikawa Railway Track 9mm Gauge N(1:150)

12V to 5V Conversion Adapter: Sakatau Electronic Components 2565

Self-propelled miniature train with built-in battery : Yoshiaki Ishikawa Finished product N (1:150)

Mini Mini Train Rail R40 (Inner Diameter 6cm, Outer Diameter 10cm) : Yoshiaki Ishikawa Railroad Track 9mm Gauge N(1:150)

Battery case B: 3 x AA: Sakatsuo material, Non-scale 2560

Mini Mini Train Rail R60 (Inner diameter 10cm, Outer diameter 14cm) : Yoshiaki Ishikawa Railway Track 9mm gauge N(1:150)

Acrylic 5mm round bar - 4 pieces : Koeido Material - Non-scale AB-5R

Battery-Powered Self-Propelled Miniature Train : Yoshiaki Ishikawa Finished product N (1:150)

Goggle rail for Mini-mini train, Daiso Case Compatible (200x100mm) : Yoshiaki Ishikawa Railroad Tracks 9mm gauge N (1:150)

Snow-covered Christmas tree with lights, height 20cm: complete bush 8624

Battery-Powered Self-Propelled Miniature Train Pantograph Type: Yoshiaki Ishikawa Finished product N (1:150)

Acrylic 4mm round bar - 5 pieces : Koeido Material - Non-scale AB-4R