The ap-led command will NOT let you disable the APs LEDs. It will merely let you switch between blinking all 4 LEDs at once and their normal state.
What that normal state is you can define in the 'AP system profile'. Here you will find an option 'LED operating mode'. Change this from 'normal' to 'off' and all AP's for which that ap system profile is active will disable their LEDs.
If you do not want to do this for all APs you will need to change the ap system profile for those APs by either applying an AP specific configuration or by creating a completely new AP-group with the new ap system profile applied to it.
Some usefull commands:
See what AP groups your APs are in:
(wlc) #show ap database
To see what ap system profile is active for that group (change default into whatever your group is):
(wlc) #show ap-group default
To make a clone of that profile with all the settings identical:
(wlc) #configure terminal
(wlc) (config) #ap system-profile leds_off clone default
To disable the leds for APs that will get the new ap system profile later:
(wlc) (config) #ap system-profile leds_off
(wlc) (AP system profile "leds_off") #led-mode off
To clone the original AP-group with all settings identical:
(wlc) (config) #ap-group leds_off clone default
To apply the new leds_off ap system profile to the new leds_off ap-group:
(wlc) (config) #ap-group leds_off
(wlc) (AP group "leds_off") #ap-system-profile leds_off
And then finaly to move your APs 1 by 1 to the new AP group with all settings identical to the first group (other than the LEDS will be off):
(wlc) #ap-regroup ap-name ap-to-be-changed leds_off
This last command will make that AP reboot and come back up with the new settings.