Indoor Furnishings User Manual

Effects of lamp diameter on beam width and luminaire efficiency
These results illustrate the effects of a smaller lamp in the same
optics:
• a 6 to 9% increase in efficiency of the luminaire
• a smaller,hence more effective,light distribution
• a higher central intensity even when using a 28 W instead of
a 32 W lamp
Absolute light distribution of a ‘TL’D and a ‘TL’5 lamp in reflector 1.
Note the 25% increase of of maximum intensity by use of ‘TL’5
compared with ‘TL’D in the same narrow beam reflector.
8
2000-11-07
Figure 2.4: ‘TL’D
(cd)
180°
0
90°
60°
30°
90°
60°
30°
γ
600
1200
1800
2400
γ = 0°/180°
γ = 90°/270°
Figure 2.5: ‘TL’5
(cd)
2400
1800
1200
600
180°
0
90°
60°
30°
90°
60°
30°
γ
γ = 0°/180°
γ = 90°/270°
Beam width Max.intensity Efficiency
‘TL’D ‘TL’5 ‘TL’D ‘TL’5 ‘TL’D ‘TL’5
°°cd cd % %
Reflector 1 2 x 19 2 x 12.5 1920 2433 78 82
(narrow beam)
Reflector 2 2 x 27 2 x 20.0 1557 1829 73 80
(medium beam)