What sfgr415 said. Look at the bumper, there are red reflectors there. It is required by law.

24607. Every vehicle subject to registration under this code shall
at all times be equipped with red reflectors mounted on the rear as
follows:
(a) Every vehicle shall be equipped with at least one reflector so
maintained as to be plainly visible at night from all distances
within 350 to 100 feet from the vehicle when directly in front of the
lawful upper headlamp beams.
(b) Every vehicle, other than a motorcycle or a low-speed vehicle,
manufactured and first registered on or after January 1, 1965, shall
be equipped with at least two reflectors meeting the visibility
requirements of subdivision (a), except that trailers and
semitrailers manufactured after July 23, 1973, that are less than 30
inches wide, may be equipped with one reflector which shall be
mounted at or near the vertical centerline of the trailer. If the
vehicle is equipped with two reflectors, they shall be mounted as
specified in subdivision (d).
(c) Every motortruck having an unladen weight of more than 5,000
pounds, every trailer coach, every camp trailer, every vehicle, or
vehicle at the end of a combination of vehicles, subject to
subdivision (a) of Section 22406, and every vehicle 80 or more inches
in width manufactured on or after January 1, 1969, shall be equipped
with at least two reflectors maintained so as to be plainly visible
at night from all distances within 600 feet to 100 feet from the
vehicle when directly in front of lawful upper headlamp beams.
(d) When more than one reflector is required, at least one shall
be mounted at the left side and one at the right side, respectively,
at the same level. Required reflectors shall be mounted not lower
than 15 inches nor higher than 60 inches, except that a tow truck, in
addition to being equipped with the required reflectors, may also be
equipped with two reflectors which may be mounted not lower than 15
inches nor higher than the maximum allowable vehicle height and as
far forward as the rearmost portion of the driver's seat in the
rearmost position. Additional reflectors of a type meeting
requirements established by the department may be mounted at any
height.

 

"OR performance of any lighting equipment", that's more-or-less why I thought possibly the parts that illuminate may be okay as not being covered at all.

"Careful though, he/she might just know." Understand what your saying and how that pertains and why, thank you Sir