High-intensity discharge lamp

A high-intensity discharge lamp comprising:

• an are tube including a main tube portion with luminescent material and a pair of thin tube portions provided at ends of the main tube portion, the arc tube having a pair of elongated electrodes;
• a power supply line connected to each electrode;
• each elongated electrode has molybdenum coils wrapped around the elongated electrodes that are positioned within each thin tube portion to prevent luminescent material from entering between the electrodes and an interior of the thin tube portion;
• a container housing the arc tube;
• and
• an adjacent conductor disposed within the container and aiding the arc tube to start discharge, wherein
• the adjacent conductor consists of a strip-shaped metal plate having at least one end portion of the metal plate as a gripping portion for gripping one of the thin tube portions, the gripping portion being curved along an outer circumferential surface of the one of the thin tube portions so as to be in contact with the outer circumferential surface, and
• the other end of the metal plate is a free end offset from the one of the thin tube portions to provide a fixing portion for attachment to the power supply line, and the gripping portion is elastically deformable in accordance with thermal expansion of the one of the thin tube portions, wherein the gripping portion and the fixing portion are aligned along a perpendicular direction to a tube axis extending through the pair of thin tube portions and the pair of electrodes, the gripping portion is positioned on the one of the thin tube portions to extend over the molybdenum coils adjacent a transition portion of the thin tube to the main tube portion to maintain heat in the transition portion to further prevent luminescent material from entering the thin tube.