T
table
lamp a portable luminaire with a short stand, suitable for
standing on furniture.
tail
lamp
a lighting device used to designate the rear of a vehicle by a warning
light.
task
ambient lighting a combination of task lighting and ambient
lighting within an area such that the general level of ambient lighting is
lower than and complementary to the task lighting.
task
lighting directed to a specific surface or area that provides
illumination for visual tasks.
thermopile† a
thermal radiation detector consisting of a number of thermocouples
interconnected in order to increase the sensitivity to incident radiant
flux.
torchère an
indirect floor lamp that sends all or nearly all of its light upward.
total
internal reflectance (TIR)† total reflection of a light ray at a
surface of a transmitting medium occurs when the angle of incidence exceeds a certain
value whose sine equals n2/n1, the ratio of indices of refraction, or when sin
r = 1, where r equals
transition
lighting in roadway lighting, lighting gauged to compensate for
visual adaptation between regions of high and low light level, as when entering
tunnels.
translucent†
transmitting light diffusely or imperfectly.
transparent†
having the property of transmitting rays of light through its substance so that
bodies situated beyond or behind can be distinctly seen (opposed to opaque and
usually distinguished from translucent).
troffer a long recessed lighting unit usually installed
with the opening flush with the ceiling. The term is derived from
"trough" and "coffer"
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