In Bitrix how can I set a custom field of type list in a lead in PHP?

I can set numbers and string from form subissions but I cannot figure out how to set a a value to a Data type list. I have a number of possible values available in the list but don't know how to set any of them. Could someone link to a tutorial or an example that demonstrates how to do this?

Unfortunately I don't speak Russian and most help resources seem to be in that language.

Data type (only for new field): List Entity: CRM_LEAD_SPD Field ID (only for new field): UF_CRM_5F1A26014BECB

ID XML_ID Value Sort.

623 407b227030a3c23c91022b233078c77b PCB 10

624 1adb2467f6ecb3519495e9f117829059 PCB (PCB and Assembly) 20

625 aab56fa9638f6f2b45de957dce4f4791 Assembly (PCB and Assembly) 30

626 406933e29d56304d36484428ba299413 Design 40

627 44c2674af0a69a99c91baa34690772a5 Bring Up

This all works except for the list under UF_CRM_5F1A26014BECB

$arLead = [

 'TITLE' => 'NEW ORDER',
 'SOURCE_ID' => 'WEBFORM',
 'NAME'  => $name,
'UF_CRM_5F1A26014BECB' => 'PCB',
 'LAST_NAME' => $last_name,
 'COMPANY_TITLE' => $company_name,
 'FM' => array("EMAIL" => array("n0" => array('VALUE' => $email, 'VALUE_TYPE' => 'WORK'))),
 'COMMENTS' => $comment,
 'UF_CRM_1582198042398' => filter_input(INPUT_POST, 'prev_order'),
 'UF_CRM_1540488601233' => $lead_time

];

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