For starters eBay can be a great place to look, once you know what your after that is. Perhaps others here can guide on that matter.
You want a lunar light? For night time viewing i take it. I don't know if others do that but i wouldnt of thought it would be ideal for a planted tank where plant growth is priority. If it was a dark tank with wood and algae for Neon Tetra's i'd understand. Personally i'd want all the bulb slots to be filled with T5 lights for the plants during photo period in the day. That would be my main priority, not lunar. Daytime viewing, night time rest for plants too
As for the light unit, i have an Arcadia which i've been impressed with untill now. Only because i need to upgrade to T5 lights.
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