Figure 8.10. Single-ended halogen
lamps.
Halogen PAR lamps are lamps within
lamps. A small halogen capsule is mounted and sealed inside a PAR bulb as shown in Figure 8.11, and
thus the advantages of halogen efficacy and long life are combined with beam control from the PAR
shape.
Precise ConstantColor Lamps
Precise lamps as shown in Figure 8.12 are very small. They are available in two
sizes:
-
35mm reflector - called MR
11
-
50mm reflector - called MR
16.
The lamps are rated at 12 volts and
need a transformer to reduce the normal 240V to 12V. Wattages range from 12 to 75W and the range of
beam spreads is from 7 to 55 degrees.
The lamp caps are all 2 pin (GU4
for MR 11 and GU5.3 for MR 16). They are available as open reflectors or with a front cover glass.
The life of MR11 lamps is 3500 hours (2000 hours for 12W). The life of MR16 lamps is 4000 hours for
all ratings except 50W which has 5000 hours life. The open reflector version should be used in
enclosed luminaires.
Figure 8.12. Precise ConstantColor
lamps.
GE's exclusive ConstantColor
dichroic coating provides consistent colour quality and long life.
-
Consistent white light.
-
No discoloration at the beam
edges.
-
No discoloration of the
reflector.
-
No fringe colours.
-
No lumen loss due to coating
discoloration.
-
50W versions have 6000 hour
life.
-
Cool beam with over 60% of IR
radiation transmitted backwards through the reflector.
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