The LEDs in the Fluval are fairly wide dispersion (think they say 120 degrees) but I'd expect that you'd see at least some reduction. Trying it now to gauge how much by shading a few inches at the end with my hand it definitely does shade it (kind of a duh conclusion there). But my tanks are a lot shorter than a 29. Higher would be better and may be enough to make up for a ~3" gap at each end. At least to some degree by the time that you get farther down in the tank anyway.
I didn't like the Finnex 24x7 that I had as much. I'd put it 3rd behind the Fluval and Current. Assuming a 29 as above and the choice between the Fluval 3 and Finnex, even being shorter I think that I'd probably go with the Fluval based on features/ease of use. I'm assuming that you're looking at the Fluval/Current/Finnex because you want the built-in ramping and other features. If maximum lighting was your main concern, then I might change that but if so then you probably wouldn't be looking at the Finnex either in that case. If features aren't as important then there are the Beamswork and similar 'budget' lights at 30" that you could get at the lower end that you could just hook up to a timer or otherwise DIY something. Also better lights as OVT mentions at the higher end.
Last edited by Mike A.; 03-18-2019 at 07:43 PM.