Ruimtehoek: bv. weinig licht onder kleine ruimtehoek cd ↑, W/m2
100% intensiteit bij 550nm:
- oog is het gevoeligst voor groen
- 1W daarvan = 683 lm
Bij 10% intensiteit:
- = 470 nm
- 1W daarvan = 68,3 lm
- 0% intensiteit: 1W UV-licht = 0 lm
Wit licht
- Theoretisch maximum lamp: 350 – 400 lm/W
Zwarte straler = elk voorwerp op een bepaalde temperatuur stuur elektromagnetische straling uit
∆Q
∆t
= ε σ A T 4 met de constante van Stefan-Boltzmann = 5,67 E(-8) W/m2 K4
,Optica en senoren Amelia Hajnus 2022-2023
emissiviteit [0, 1]: karakteristiek voor oppervlak
zwart oppervlak = 1
is gelijk voor emissie en absorptie
absorptie A: analoog emmisiviteit
∆Q
Netto warmtestroom: ∆t
= ε σ A(𝑇1 4 − 𝑇2 4 )
Zon: ± 5800 K
Gloeilamp: ± 2700 K rode lijn: weinig intensiteit in VIS hant af
Halogeenlamp: ± 3000 K van filament (smeltT)
Wet van Wien: λp T = 2,90 E(−3) m ∗ K
met p de piekgolflengte/golflengte bij piekemissie
Hoe ↑T, hoe blauwer de kleur (maximum verschuift)
Hoge efficiëntie ± 100 – 200 lum/W
Wegverlichting, waar kleur minder belangrijk is, niet voor residentiële verlichting
Opstarttijd met kleurverschillen
Bij planten
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