Lamps with four lengths of tubing are called quad lamps, Q lamps, or double-twin tubes. Cap light refers to encapsulated tungsten halogen lamps. The halogen capsule is encased in a heavy glass shell that looks similar to a standard light bulb. The color rendering index associated with incandescent light is 100. Compact fluorescent bulbs have CRIs in the low 80s, while older long-tube fluorescents usually have CRIs in the 60s.
Color temperature measures the color of the tube itself.
Don't take the easy way out. It is easy to specify a circular fluorescent for installation in a porcelain socket holding a 60W bulb. So auditors should have fixtures in their inventory. The retrofit involves removing the porcelain fixture to reveal the junction box and wire terminals and connecting the two wires to the ballast on the new fixture. I often recommend fixture replacement in multifamily hallways.