| 摘要 |
<p>A discharge tube arrangement comprises a launcher (60, 110) and a discharge tube (62, 112) positioned in part within the launcher (60, 110). When the launcher (60, 110) is energised with radio frequency (r.f.) power, surface waves are excited in the discharge tube which contains a fill. An electrically conductive structure (64, 79, 80, 114, 118, 120, 122) extends along the discharge tube and is connected to an earth when in use. The structure (64, 79, 80, 114, 118, 120, 122) is separated from the discharge tube (62, 112) by a radial distance such that, in use, the discharge tube (62, 112) produces an increase in total light output over the total light output of a discharge tube not having this structure. The structure (64, 79, 80, 114, 118, 120, 122) comprises an insufficient quantity of material to obscure this increase in total light output.</p> |
