Quoted from Gatecrasher:

The very first LE I ever looked at closely had the lamp boards and I immediately assumed it had them just like the 3rd edition did. Then over the years I looked at several more LE's and none of them had the lamp boards so then I assumed a previous owner must have swapped playfields in the one I saw.
But now that I see another LE with the lamp boards I'm wondering if maybe Bally switched to them at the end of the LE production run (which wasn't really that large).