I have a vague plan to make a floorstanding fluorescent lamp (I don't want to use LEDs because I also want this light to be flicker free for my occasional video recording). The fluorescent tube will be inside a polycarbonate tube which will fit into recesses in the top and bottom parts of the lamp to protect it somewhat. The high frequency control gear will go in the bottom and I wanted to run the two "cold" wires through one of the steel tubes to the top of the lamp. My question revolves around a bullet point in the data sheet for one possible control gear https://www.tridonic.com/com/en/download/data_sheets/PCA_T8_ECO_lp_xitec_II_en.pdf - I might end up using a different control gear but I imagine the advice is still relevant. The bullet point says: "keep the distance of lamp leads from the metal work as large as possible" and is under an "RFI" heading which I suppose stands for radio frequency interference? Is passing the cold leads through the steel tubing liable to affect the function of the lamp? The hot leads would be very short and would not pass through the metal tubing. The leads would be twisted as suggested by the datasheet, although I don't know how many twists per unit length would be optimal. Can the RFI of the steel tubing be mitigated? The tubing would probably be 1600 mm long, 12.7 mm OD, 1.2 mm thick.