Ignition Integrated Antenna (PIA) technology increases reliability, reduces premature failure and ensures fast re-ignition times. The most energy-saving high-pressure sodium lamp due to high luminous efficiency. Transparent tubular bubble. Ceramic arc tube with integrated ignition antenna. Rugged construction with fewer (7) internal welds provides vibration and shock resistance and extends lamp life. The zirconium-aluminium gas canister ensures optimal maintenance of the luminous flux value and low reliability. The Plus version means increased luminous efficiency. Contains no lead.