I've tested it and the resistance is 809 ohms so that is 59.8W @ 220v, exactly as it should be, my voltage is 240 so thats 70W in practice.
Has anyone using the greenhouse tube heaters found they get very hot? Or these heating wires for that matter, I suppose I should expect fairly high temps as the silicon sheath has to dissipate that amount of heat from a 1.5m length.
Am I just being a bit naive? Wouldn't be the first time

Thoughts?