Agreed Miner42....this sounds pretty consistent with what Dealers recommend. My local Dealer asserted they would "never use a Lyra with less than 470 ohms", but it really depends on the sum of the capacitance of your phono stage, ext phono cable and internal (tonearm) phono cable. For many setups 100 ohms will be a safe setting.
(FWIW I'm using 220 ohms)
(FWIW I'm using 220 ohms)