Laravel query outside database with 'between condition

I'm confused at Laravel's query DB. Here is my code:

collect(DB::connection('2ndDB')->select('select avgvalue, logtime from 2ndDB.mytable where logtime =?',array('14:38')));

It does work on and return the right value. However, once I change the SQL statement with 'between' condition, down here:

collect(DB::connection('2ndDB')->select('select avgvalue, logtime from 2ndDB.mytable between logtime =? and ?',array('14:38','15:00'))); 

It would get error. May I ask how to fix it?

Note: I am query the outside database that the 'mytable' is not declared in the mode/database/migration part. So, I use the (DB:connection()) in this way for query.

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