Photometrics Quiz (20 pts)

Question 1: The PPFD unit µmol/m²/sec, corresponds to how many photons/m²/sec?

Question 2: The irradiance of 1 watt/m² contains more PPFD for which of the following coloured lights?

Question 3: What is the difference between Correlated Colour Temperature (CCT) and Colour temperature (CT)?

Question 4: Which colour temperature is more suited for an office?

Question 5: The relation between Lux to Candela is similar to which of the following radiometric relations?

Question 6: What does the S/P ratio of a light source mean?

Question 7: The lamps with high S/P have which of the following qualities?

Question 8: What is the spectral range corresponding to far-red radiation?

Question 9: What could be the CRI index of a low pressure sodium lamp, which is a monochromatic source?

Question 10: What are the corresponding wavelength ranges to UVA, UVB and UVC radiation?

Question 11: What is the wavelength range of visible light?

Question 12: A blue photon has _______ energy as compared to a red photon.

Question 13: Which statement is most accurate about the difference between a photometer and a spectrometer?

Question 14: The Sun’s radiation is effectively a _______ black body radiation.

Question 15: The refractive index of a medium is the ratio of


Question 16: If one Watt of 555 nm green light is equivalent to 683 lumens, what is the most likely lumen value for a 730 nm light?

Question 17: What is the difference between absolute temperature and colour temperature?

Question 18: Which statement about colour temperature is correct?

Question 19: In the US, the light bulb packaging has the requirement to specify the output of the lamp in lumens. If the output of a 60 Watt incandescent lamp is marked as 900 lumens, which of the following compact fluorescent lamps is likely to have the same output in lumens?

Question 20: What is the difference between the photometric units of candela and lumen?