Civil Engineering Reference
In-Depth Information
TABLE 30-5. Comparison of Lamp Characteristics
System
Efficacy
(lm/W)
Color
Rendering
Index
Lamp Life
(hours)
Start to Full
Brightness
Lamp Type
Wattage
Restrike Time
Standard incandescent
3-1,500
6-24
750-2,000
95
Instant
Instant
Tungsten halogen
10-1,500
18-33
2,000-4,000
95
Instant
Instant
Fluorescent
40-125
50-100
7,500-24,000
62-92
0-5 seconds
Instant
Compact fluorescent
5-40
50-80
10,000-20,000
82-86
0-1 minute
Instant
Mercury vapor
40-1,250
25-50
24,000
22-52
2-5 minutes
3-10 minutes
Metal halide
32-2,000
40-100
6,000-20,000
65-85
4-6 minutes
10-20 minutes
High-pressure sodium
35-1,000
40-140
16,000-40,000
21-80
2-5 minutes
1 minute
Low-pressure sodium
18-180
120-175
12,000-18,000
0-18
10-15 minutes
Instant
