I have no trouble seeing the fluid level on an original Amadeus's vat when using an LED headlamp. Not sure about the same visibility with the LTD arm and cosmetic cover over the golf ball, but I assume it to be quite doable as well. Tiny adjustments in the fluid level via adjusting the vat height might be required after a few listening sessions anyway. FWIW, I always shoot for 1/4 -1/3 of the golf ball submerged in the fluid.