lights

Light energy taht is not absorbed by an object can be ____

Reflected from and / or transmitted through the object.

A light that is considered warm in tone is porduced by lamps with temps of

3,000k

The resistance of a tungsten filament is ___

Much higher after the lamp is turned on.

The filament of a tungsten halogen lamp is encased in a capsule typically containing iodine or ___ 

bromine gas

During operation a high output fluorescent lamp typically has a current draw of ___

800ma to 1,000ma

The olderst type of high intensity discharge lamp is the ___

Mercury vapor lamp

The diameter of a 4’ long, t-12 fluorescent lamp is ____

1 1/2”

To improve both ballast efficiency and lamp efficacy, an electronic ballast typically operates the connected fluorscent lamps at a frequency of ___

50 Hz to 60 Hz

To what type of lamp does a driver provide stable power?

LED

Most code requirements governing the installation of luminaires, lamp holders, and lamps are covered in ____

NEC ARTICLE 410

Whips used to connect a luminaire to a nearby junction box mounted above a suspended ceiling must have a minimum lengthy of ___ 

18”

The maximum luminaire whip lenghty when wiring suspended ceiling luminaires is ___ 

6’

Suspended luminaires used in commercial and industrial buildings are supported by the ____ 

building’s structural memebers

when installed on a wall, the track for track lighting must be minimum of____ 

5’ above finished floor. 

When cutting the branch circuit wires in an outlet box in preparation for connecting a luminaire, the amount of free conductor length that should be left where it emerges from the cable sheath or raceway is ____ 

6”

when light strikes an object it can be ____, ____, and ____

absorbed, reflected, and refracted.

when light passes through a prism, the spectrum ranges from ___ on the higher wavelength fo ___, on the lower wavelength

790nm, 380nm

Nanometer = ______

1 billionth

True or false? Lamps at equal wattage have the same lumen and life ratings. 

False

Which HID lamp produces light with the best color rendition?

Metal Halide Lamps

True or False? When installing fluorescent lamp it should be rotated ¼ turn in its lamp holder to seat and connect it.

True

Which of the following types of fluorescent lamp ballasts provides the best lamp life? 

Electronic Programmed Start Ballast

A ballast supplies the power to an HID lamp; siimillarly an ____ supplies power to an LED

Driver

When opening a shipping carton containing a luminaire, wear ___

Clean gloves.

True or False? When installing a ceiling mounted luminaire that weighs more than 50lbs, it must always be supported independently of the outlest box, unless it is listed and labled for such use. 

True

A luminaire whip connected between a junction box mounted above the mounted suspended ceiling and a luminaire installed in a suspended ceiling must have a minimum length of ___ and can be no longer than ____

18” to 6’

Recessed luminaires not labeled type IC must be installed so that they are at a minimum distance of ___ away from any adjacent insulation. 

3”

When fluorescent LED trofferes and other luminaries are installed in suspended ceiling, the ceiling framing members must be securely fastned together and to the ____ 

Building’s structural members

True or false? luminaries and or accessories for track lighting systems can be used interchangeably between systems made by different manufacturers. 

False

When cutting the branch circuit wires in prep for connecting a luminaire,you should leave at least ____ of free conductor length at the outlest box avoce where the wire emerges from tits cable. 

6”

In humans nearly ____ rod cells are sensitive to low levels of light and are spread throughout the entire retina. 

90 million

Tests show that about ___ individual colors can be identified within the visible spectrum 

125

Light flow through the eye: 

cornea, pupil, lens, retina

Luminaire: 

A complete lighting unit consisting of a light source such as an lamp, and the parts designed to position and protech the ight sournce and distribute the light.

CRI

COLOR RENDERING INDEX

Incandescent bulbs became practical in

1880

in the year ____ congress passed the law for no more standard use incandescent, but it wasn’t until july ___ that it really went into effect.

2007. 2023

Floursecent lamps are ___ coated

phospor

if a lamp is rated as having an average of 12,000 hours this is basedon the lamp being turned on ____ times for an aveerage of 3 hours. 

4000