I used a converter for cm to in. Don't know what I messed up then.
Lighting can wait til after the cycle. In order to advise you on what type of light, have to figure out what you think you'll want to keep in the tank. Different corals and anemones need different light. Some are more tolerant of lower light than others. For a soft coral tank and maybe a bubbletip anemone, power compact lights work well. For sps
corals and anemones like the carpet or ritteri anemones, they need higher light like metal halides. Also, I want to add that anemones shouldn't be added to the tank til it's about 9 months old. They require a mature stable tank to do well.
I keep my temps at 80 expect through the summer due to heat issues it stays at 82. 78-80 is good though.
The cycling process could take longer than 3-4 weeks. I cycled my tanks with base rock (dry rock), sand and a raw shrimp and it took about 6wks to complete. However, if you cycle using uncrured live rock, that helps shorten the cycle time. Also, if you get some fresh or fully cured live rock, you may have an even shorter cycle since the live rock will be carrying the nitrifying bacteria already.