Q. For the same wattage, which of the following lamp is cheapest? (Solved)
1. Mercury vapour lamp
2. Fluorescent tube 4 ft.
3. Fluorescent tube 2 ft.
4. GLS lamp
5. Sodium vapour lamp
- d. GLS lamp
1. Mercury vapour lamp
2. Fluorescent tube 4 ft.
3. Fluorescent tube 2 ft.
4. GLS lamp
5. Sodium vapour lamp