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Lichtbündel n
gen.	light pencil
agric.	ray of light
astr.	beam
chem.	pencil of rays
el.	beam of light
met.	light bundle
opt.	bundle of light; cone of light
phys.	light-ray pencil; pencil of light
tech.	light beam
textile	pencil of light rays

Lichtbündel: 6 phrases in 2 subjects

Optics branch of physics	5
Transport	1