At the risk of sounding totally ignorant, how long are the bulbs for a 46.5 inch lighting system. My tank is 48 inches long but I bought a 46.5inch setup so I would have a little room to move around. So are the bulbs 46.5 inches long or is it the bulb AND endcap that equal 46.5 inches long?

Also, do the URI VHO Super Actinic Bulbs have a built in reflector and if so how does it work?