Hi.
i've seen top quality layout with all these fixtures, they are all good!
My personal impression of each one:
- Chihiros A Series Plus:
very light
very small
nice build
very cheap
powerful
with dimmer included
stays very cool.
Light colour a bit green for my taste, but that's subjective.
- Chihiros RGB:
Small unit, larger than SerieA,
thinner than Twinstar,
no so good build as serieA,
diffuser is crappy (easy to take out),
very powerfull, with dimmer,
very cheap, good deal for the money
eats a lot at fullpower
color is wonderfull (if you like it), the closest to ADA rgb IMO
- Twinstar 600E
the best construction of these 3 fixtures (much better),
very good colour rendition,
stay's relatively cool,
it's the biggest of the fixtures, better light distribution but also big on the tank (for maintenance)
very good design (it's a matter of taste),
acrylic (lateral stands) can easily get water spot's (this can be annoying)
you can't adjust to other tank dimension (only 60cm) and no height variation (here Chihiros solution is clever)
take a look at new version without the acrylic stands (better option, i think),
the new version is also more powerful, and you can hang it (i prefer that),
the new Twinstar heat's a lot (better to buy a dimmer) and give toons of light
My advice is go to a shop, look at these fixtures in live, feel the material and construction.
Buy the one that you prefer (colour maybe), you'll be well served with any one.
Cheers