TD5 stands for Tungsten/Daylight - 5 lamps. You can insert up to 5 lamps into this one fixture using a standard E26 or common household base. What this light offers is the ability to run either five -150 watt (3200 Kelvin) Halogen lamps or five - 23 watt (5500 Kelvin) Fluorescent lamps.
This unit allows you to quickly change not only your color temperature but your environment temperature as well. There are 3 separate controls on this unit, one which pairs your top and bottom lamp, one which pairs your right and left lamp and one for your center lamp.
You can run any combination of lamps all with no shift to color temperature by simply turning on and off multiple switches. This allows the end user to set up lighting ratios when using multiple heads on one set.
The body is also constructed of solid metal as well as direct attachment points for a soft box onto the Spiderlite TD5. Both Spiderlite units offer a handle and may be easily turned to change position of a soft box from horizontal to vertical.