Open Access
Table 2
Comparison of incandescent, fluorescent, high-pressure sodium, and LED lamps
| Incandescent lamp | Fluorescent lamp | High-pressure sodium lamp | LED lamps | |
|---|---|---|---|---|
| Luminous efficacy (lm/W) | 16 | 70-90 | 110-135 | 80-150 |
| Color temperature (K) | 2,400-2,900 | 3,800 | 1,900-2,800 | 4,500-6,000 |
| Color rendering index | 95-99 | 60-90 | 23 to 25 | 75-80 |
| Life span (h) | 1,000-2,000 | 8,000-15,000 | 20,000-28,000 | 50,000 |
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