I'm using a DE Lightings set, 4x54W for my 4x2x2. With the individual reflectors, it's very powerful...i'd say the 4x54w (216W) far outstrips another PL lightset i have that is 190W in total despite the similarity in wattages.
The DIY set is not that much cheaper than the one DE Lightings builds for you. If you add in the extra cost for the Tridonic ballasts, different endcaps etc, I found that the built in "labour cost" was well worth it for my 4x54W. You'll have to make the call yourself, but do factor that in. The retrofits come with China/Singapore made ballasts I believe, while the Tridonics are a well known Austrian brand.
All in all, I'm happy with my DE Lightings set, though they are admittedly on the very pricey side. I especially like the mounting, as I don't have to have the lights hanging from the roof or on legs on top of the tank. The mounting fits snugly within my open top hood, and the light is "hidden" as it's flush against the top.
P.S. I can't be sure as I don't own a Solite, but I think I read somewhere that Solite reflectors are not as good as DE Lightings ones. Further, the DE Lightings ones can be adjusted to ensure a better spread through your tank...the Solite ones can't I think, and that means you will have one brightly lit strip in your tank, with the rest lit by ambient/stray light and thus significantly dimmer...that's a consideration. With my 4x54W, I adjust the reflectors so that i can get as even a spread as possible.
P.P.S. Solites are hard to find these days
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