It does not have a light. You will need to run a command to see the RSSI
(Aruba7650-US) #show ap mesh neighbors ap-name Mesh-225
Neighbor list
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MAC Portal Channel Age Hops Cost Relation Flags RSSI Rate Tx/Rx A-Req A-Resp A-Fail HT-Details Cluster ID
--- ------ ------- --- ---- ---- ----------------- ----- ---- ---------- ----- ------ ------ ---------- ----------
9c:1c:12:90:59:50 9c:1c:12:90:5d:91 149E 0 1 1.00 C 3d:21h:26m:15s VLK 26 780/780 2 2 0 VHT-80MHz-3ss 3FEEF727-4ACE-4586-9817
9c:1c:12:90:59:51 9c:1c:12:90:5d:91 149E 0 1 1.00 N 3d:21h:26m:56s VLK 25 - 0 0 0 VHT-80MHz-3ss 3FEEF727-4ACE-4586-9817