300 lm/W 16 lm/W 70 lm/W Illustration: © Johan Jarnestad

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LIGHT BULB (19th century)

OIL LAMP (approx. 15 000 B.C.)

FLUORESCENT LAMP (20th century)

LED (21st century)

0,1 lm/W

300 lm/W

70 lm/W

16 lm/W

Illus

trat

ion:

© Jo

han

Jarn

esta

d/Th

e Ro

yal S

wed

ish

Acad

emy

of S

cien

ces

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