Question

(a) Figure 1 shows the normalized spectral power distribution (SPD) curves for three lamps alpha, beta and gamma. The raw data points used to plot the curves are provided in the spreadsheet file named SPD.xlsx. Describe the method of obtaining these SPD curves. Relative intensity (a.u.) 1.0 alpha beta gamma 0.8 0.6 0.4 0.2 0.0 400 450 500 550 600 650 700 Wavelength (nm) Figure 1 (b) Making use of the matching colour functions table provided in the spreadsheet file named CMF.xlsx, (i) Calculate the CIE chromaticity coordinates for the three lamps; (ii) Making use of the CIE chromaticity diagram, estimate the colour temperatures or correlated colour temperatures of the lamps; (iii) What kinds of lamps are alpha, beta and gamma? Explain your choice; (iv) Describe the mechanism of white light generation for the lamps; (v) Predict the colour rendering indices of the lamps, with explanations.

          (a)
Figure 1 shows the normalized spectral power distribution (SPD) curves for three
lamps alpha, beta and gamma. The raw data points used to plot the curves are provided in
the spreadsheet file named SPD.xlsx. Describe the method of obtaining these SPD curves.
Relative intensity (a.u.)
1.0
alpha
beta
gamma
0.8
0.6
0.4
0.2
0.0
400
450
500
550
600
650
700
Wavelength (nm)
Figure 1
(b) Making use of the matching colour functions table provided in the spreadsheet file
named CMF.xlsx,
(i)
Calculate the CIE chromaticity coordinates for the three lamps;
(ii)
Making use of the CIE chromaticity diagram, estimate the colour temperatures or
correlated colour temperatures of the lamps;
(iii)
What kinds of lamps are alpha, beta and gamma? Explain your choice;
(iv)
Describe the mechanism of white light generation for the lamps;
(v)
Predict the colour rendering indices of the lamps, with explanations.

(a)
Figure 1 shows the normalized spectral power distribution (SPD) curves for three
lamps alpha, beta and gamma. The raw data points used to plot the curves are provided in
the spreadsheet file named SPD.xlsx. Describe the method of obtaining these SPD curves.
Relative intensity (a.u.)
1.0
alpha
beta
gamma
0.8
0.6
0.4
0.2
0.0
400
450
500
550
600
650
700
Wavelength (nm)
Figure 1
(b) Making use of the matching colour functions table provided in the spreadsheet file
named CMF.xlsx,
(i)
Calculate the CIE chromaticity coordinates for the three lamps;
(ii)
Making use of the CIE chromaticity diagram, estimate the colour temperatures or
correlated colour temperatures of the lamps;
(iii)
What kinds of lamps are alpha, beta and gamma? Explain your choice;
(iv)
Describe the mechanism of white light generation for the lamps;
(v)
Predict the colour rendering indices of the lamps, with explanations.

Added by Lori F.

Question

Please give Ace some feedback