Economic accounting
(100,000 street lamps,365 days,a lighting time of 10 hours)
(100,000 street lamps,365 days,a lighting time of 10 hours)
| HPS street lamp | LED street lamp | Savings | |
| Single lamp rated power | 250W | 120W | |
| power supply power factor | 90% | 97%(220V Measured) | |
| power efficiency | 85% | 92%(220V Measured) | |
| the actual power consumption | 326W | 115%(220V Measured) | |
| Total consumption of electricity (kilowatt/hour) | 118,990,000 | 41,975,000 | 77,015,000 kWh |
| electricity (0.825 yuan/kWh) | 98,166,750 | 34,629,370 | 63,537,380 yuan |
| maintenance costs (yuan) | 2,395,325 | 239,531 | 2,155,794 yuan |
| mission reduction cost (130yuan/ton) | 56,683 ton | ||
| mtotal savings (electricity+maintenance fee) | 7,368,795 yuan | 65,693,174 yuan | |
| total savings (electricity+maintenance fee) | 73,061,969 yuan | ||
| the overall economic efficiency (electricity+maintenance cost+reduction benefits) |
the realationship between high-power white LED Tj
and life time (70% lumen maintenance)
and life time (70% lumen maintenance)
| Tj (℃) | life (hour) | Tj (℃) | life (hour) |
| 25 | 234000 | 85 | 29500 |
| 30 | 191000 | 90 | 25700 |
| 35 | 157000 | 95 | 22300 |
| 40 | 129000 | 100 | 19500 |
| 45 | 107000 | 105 | 17100 |
| 50 | 90000 | 110 | 15100 |
| 55 | 75000 | 115 | 13300 |
| 60 | 64000 | 120 | 11700 |
| 65 | 54000 | 125 | 10500 |
| 70 | 46000 | 130 | 9300 |
| 75 | 39000 | 135 | 7500 |
| 80 | 34000 | 140 | 6000 |