Photometric Training (100 pts) (copy)

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

Question 2: The irradiance of 1 watt/m² will have more PPFD for which of the following coloured lights? (copy)

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

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

Question 5: The relation between Lux to Candela is similar to which of the following? (copy)

Question 6: What is S/P ratio of a light source mean? (copy)

Question 7: Lamps with high S/P have which of the following qualities? (copy)

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

Question 9: What is the CRI index of low pressure sodium lamp? (copy)

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

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

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

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

Question 14: The Sun’s radiation is effectively a _______ K blackbody radiation. (copy)

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


Question 16: An automobile headlamp (high-beam) is most likely to have which of the following candela levels? (copy)

Question 17: If 1 Watt of 555nm green light is equivalent to 683 lumens, what is the most likely lumen level for a 730 nm light? (copy)

Question 18: 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 florescent lamps is likely to have the same output in Lumens? (copy)

Question 19: What is the difference between photometric units of candela and lumen? (copy)

Question 20: Which of the following radiometric units corresponds to the photometric unit of candela/m²? (copy)

Question 21: What is the difference between absolute temperature and colour temperature? (copy)

Question 22: Which statement about colour temperature is correct? (copy)

Question 23: Which statement about comparison between LI-COR detector and Allied Scientific Pro’s Lighting passport is most accurate? (copy)

Question 24: What is the relation of the unit of illuminance which is measured in lux to other photometric units? (copy)

Question 25: What is the difference between photometry and radiometry? (copy)

Question 26: In agricultural lighting application the unit µmol/m²/sec is often used to measure illuminance of light instead of lux. Why this unit is preferred to lux? (copy)

Question 27: What is the advantage of the chromaticity diagram CIE1976 (u’,v’) over the chromaticity diagram CIE1931(x,y)? (copy)

Question 28: Point light source A of luminous intensity l1v (in units of Candela) is at a distance r from a photometer. If this source is removed and is replaced with another point source B of luminous intensity I2v, placed at 40 cm distance from the photometer, the same luminance (in units of Candela/m²) is measured. However if source A is placed at its original location and a particular glass sheet is inserted between this source and the photometer, then source B has to be moved 10 cm away from its original position to achieve the same luminance. What is the absorption coefficient of the glass sheet? (copy)

Question 29: What is the difference between PPFD (Photosynthetic Photon Flux Density) and YPFD (Yield Photon Flux Density)? (copy)

Question 30: What is a typical value for luminous intensity of a circuit board light emitting diode? (copy)

Question 31: Which of the following photometric relations are correct? (copy)

Question 32: What does average CRI index Ra indicate? (copy)

Question 33: What are the three distinct attributes of colour? (copy)

Question 34: Which of the following shows the variation of natural colour (daylight and moonlight) throughout a 24 hour day? (copy)

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