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How to select a suitable device
Select the device by the current of the lighting system in each circuit. For example, in a fire escape, there are 40 lamps of 36W Fluorescent lamp per circuit. 40 lamps of Fluorescent 36W is equal to 18 Amp(40 lamps x 0.45 Amp, from table below). All in all, we would choose the 20 amp model [PSJP-20], or we can choose the ‘one to one’ model [PSJFL-18/36].
| Type of lamp | Watt | Amp per lamp |
| FL | 18W | 0.37 Amp |
| 36W | 0.45 Amp | |
| HID | 70W | 1 Amp |
| 100W | 1.2 Amp | |
| 150W | 1.8 Amp | |
| 250W | 3 Amp | |
| 400W | 4.5 Amp | |
| 1000W | 10 Amp | |
| 2000W | 20 Amp |
The device is suitable for use
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The table shows the calculation of electricity
| Type of lamp | Fluorescent 36W | |
| Quantity of lamp | 1 | lamp |
| Month | 12 | months |
| Average working time | 30 | days |
| Average working hours per day | 12 | hours |
| Electricity rates | 4 | baht per unit |
| Type of lamp | FL 18W | FL 36W |
| Ballast Loss (W) | 6 | 6 |
| Electricity per year (Baht) in proportion to usage | ||
| Energy used (kW.Hr) 100% | 414.72 | 725.76 |
| Energy used (kW.Hr) 80% | 331.78 | 580.61 |
| Energy used (kW.Hr) 70% | 290.30 | 508.03 |
| Energy used (kW.Hr) 60% | 248.83 | 435.46 |
| Energy used (kW.Hr) 50% | 207.36 | 362.88 |
| Savings per year (Baht) | ||
| Energy saved (kW.Hr) 100% | 0.00 | 0.00 |
| Energy saved (kW.Hr) 80% | 82.94 | 145.15 |
| Energy saved (kW.Hr) 70% | 124.42 | 217.73 |
| Energy saved (kW.Hr) 60% | 165.89 | 290.30 |
| Energy saved (kW.Hr) 50% | 207.36 | 362.88 |
Example: 51 th and 46th floor high building in fire stair and parking lot
| Type of lamp | Fluorescent 36W | |
| Number of lamps in parking lot | 3,943 | lamps |
| Number of lamps in fire escape | 537 | lamps |
| Operating Hours | 24 | hours per day |
| Devices | Circuit based model | PSJP-10,PSJP-20,PSJP-30 |
| Electricity charge before installation | 6,593,126.40 | baht |
| Electricity charge after installation | 3,296,563.20 | baht |
| Electricity charge savings per year | 3,296,563.20 | baht |
| Investment budget | 4,704,000.00 | baht |
| Break-Even | 1.43 | year |