A like-for-like comparison of both fixtures on the same aquarium.
Does the Solar RGB II materially improve usable PAR distribution and edge coverage over the original fixture on a 90P?
The original fixture is limited by coverage rather than peak output, and raising it to widen the footprint costs more at the ends than it gives back. The second-generation fixture is stated to be around 1.5 times brighter, and that surplus is described by retailers as what allows a higher mount. Whether it nets out better at the edges of a 90 cm tank is a measurable question that no published figure currently answers.
Stated openly so it can be wrong: the extra output will be enough to hang the fixture higher and still leave the outer positions better off than they are now. The competing possibility is that the loss from height eats the gain and the edges land roughly where they already are.
Recorded before measuring, so it can be shown to have been wrong.
Not run yet. The method is set out under Measurements below.
No observations yet. This experiment has not produced data.
Results describe this specific aquarium under the conditions recorded above. They are observations, not universal recommendations.