People seem to think you're paying more for the design rather than usability. Plus, I'm looking for something which will emit a bit of heat in the hope of promoting emerged growth - this seems to be the thing Kessil is trying to minimise, which is understandable. Saying that, the a350w for my marine caused a considerable amount of evaporation so who knows.
I tend to find that most of the tank evaporation that occurs is due to the tank water being ~24 degrees and warmer than the rest of the room, especially in winter. The Kessil lights don't kick out much heat. I don't think you will struggle with heat for emergent plants though as they will be sitting either in or just next to a large liquid radiator (the aquarium) so should be just fine. They do however create a tiny bit of fan noise, which is too much for some people, but I don't really notice it. The only other thing to note is that these aren't really dimmable unless you do some diy. Having said all that though I love them and wouldn't change them now, they look great and if you can get the 90 degree adapter for the gooseneck then they are even better.
Mike
Surprised by the size of the orphek in comparison, had any first hand experience? The TMC is pleasing price wise but having to buy a dimmer and the mounting kit separately is slightly irritating. Apprehensive about dangling things from the ceiling as it seems to be plaster and our property is rented .
The Kessil & gooseneck are looking more and more attractive. The sound shouldn't be an issue, but I'm still unsure whether it will emit enough heat to promote emerged growth. Planning on having a Nyphaea and a few others attached to wood along the water's surface.
Big fan of your journals by the way Alastair!