When opening the Atlas via Ctrl+A, then you can click at the new worlds and check out the requirements to enter those.

However, if you have 0 Light, then u9 Geode will only display a requirement of 100 Light without any sign of a Power Rank requirement.

After you finally reached 100 Light, you will now see only 10000 Power Rank as the only Requirement without any sign of Light requirement anymore.

Always beeing able to see what Light and Power Rank those new Geode worlds will require in order to enter, unrelated to what Power Rank and Light you currently have.