(I'm still not to post allowed links, even in quotes!)

Cheers... I've done my usual unscientific method, and downsized from a 3w Dynamo to a 1.5w, whilst also attempting to up the taillight count! I thought with the Seculas being small, they'd be no big deal - but looking at that table you provided, they actually draw more power than the Topline does I guess that's down to the Topline using a large reflector to boost its footprint, whereas the Seculas are all active.

Thanks for the info - I'll try to manage my expectations accordingly!

Worst case scenario, I can transfer one/both of the Seculas to another bike(s) - I would be a smidge disappointed, though!