Extension to https://gist.github.com/darrenjrobinson/0c0744a9868ff4e36ab776173f0889f4 to control multiple lights

ChangeHueLightsState.ps1

# Collection of lights
$lights = @()
$lights +=4 
$lights +=5
$lights +=6

foreach ($light in $lights){

    $status = Invoke-RestMethod -Method Get -Uri "$($hueBridge)/$($username)/lights"
    $currentState = $status.$light | select state

    If ($currentState.state.on.Equals($false)){
        $body = @{"on"=$true} | ConvertTo-Json
        write-host "Light $($light) is OFF, turning it ON"
    } else {
        $body = @{"on"=$false} | ConvertTo-Json
        write-host "Light $($light) is ON, turning it OFF"
    }
   
    $result = Invoke-RestMethod -Method PUT -Uri "$($hueBridge)/$($username)/lights/$($light)/state" -Body $body
    $result
}