300 lm/W 16 lm/W 70 lm/W Illustration: © Johan Jarnestad ...
1
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 Illustration: © Johan Jarnestad/The Royal Swedish Academy of Sciences
Transcript of 300 lm/W 16 lm/W 70 lm/W Illustration: © Johan Jarnestad ...
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