Traditional system:
- Ballast located in the electrical cabinet. It needs to be positioned near the channel at a maximum distance of 8 metres from the lamp racks. The dissipation of the heat produced by the ballasts is achieved through the construction of an insulated and cooled room.
- Cleaning system driven by a hydraulic piston. It needs a compressor for its operation.
- Teflon scraper ring does not remove inorganic deposits; it requires periodic chemical cleaning outside the channel.
- Uncoated lamps that suffer from the problem of early solarization and maximum lifetime of 8,000 hours.
- Installation made burdensome by the great number of cables connecting each lamp to its dedicated ballast in the electrical cabinet and the other electro-mechanic equipment, like the compressor for the cleaning system.
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