Have recently added a second rear light to me bike to go along with a Cateye TL1000.... Manufactured the rear light from an AA Maglite, which I then converted to a red LED with one of these. Its attached to the rear carrying rack with some Maglite brackets. A tailcap switch like this one can be installed to so that it can be used in flashing mode (although this particular switch auto powers off after 14mins!!). Costs were: Maglite £12.99, new LED £21.95, brackets £5.39, switch (not really necessary) £8.39, metal plates to attach brackets to rack approx £1.20 (from Wilkos). It is pretty bright - some photos here, here, and here alongside the Cateye. Found it difficult to get the settings on the camera right to get a decent comparison to show the differences in how the two appear. I've focussed the Maglite to a spot, and is fairly impressive on the illumination front (well I think so anyway!!). Ought to be visible from quite a distance I'd think - idea is to use the Maglite as a steady light and leave the Cateye on flashing. An alternative to the Maglite is this LED Lenser effort which is manufactured with a red LED so no need to convert, although there's no way of changing how the beam is focussed. I've got a similar LED Lenser torch and it is bloody bright!