Thanks Barry. I've got lightbulbs and filters coming my way to play around with.
Another quick question - going back to the earlier post on page 1 regarding lack of any major change with/without a new-ish MTH lighted passenger car on the track. I would have thought the bulbs in the cars (or the switch tower accessory I had hooked up to track power, now removed) had 18 volt bulbs in them. Wrong?