Where will the lamp live?
What are you growing?
Where will the plant sit?
Your recommendation
Anthos at its full height
You are lighting a tree in a dark room, so you want the full 180cm of reach and the whole canopy lit rather than the top leaves.
Anthos at neutral position
Standard setup. Around 105cm covers most large foliage plants, with the range to raise it as they grow.
Anthos low, on a daily schedule
Short throw, long hours. For seedlings and herbs a reliable daily schedule matters more than height.