Just read some of the specs....... I am using this on 40 x 25w bulbs, which give 1000w total, is this OK? The spec says max load 1000w but also states lowering the total by 25% for candle lamps (whatever they are)
Candle lamps are lamps shaped like a candle flame. (I have no idea why it makes a difference to the loading). 40 x 25 is 1000 so it's just inside the spec. I assume your bulbs are normal - not halogen or low wattage CFLs or any such thing -right? I think TLC Direct are pretty good at answering queries if you call or EMail.
If you overload the dimmer, the only real risk is that you kill the dimmer. In my opinion, it's rarely a good idea to run anything up to its max spec for prolonged periods. I doubt you'll find anything more robust simply because lighting circuits aren't normally rated above 1kw anyway. It might be an idea if practical to split the array into two halves; in the long run it might save a few replacement switches.