The following CU tables are included for several reasons:

1 They represent common lamp/fixture/trim combinations (luminaires) used in residential lighting. Notice the description for each luminaire. Some are included to demonstrate just how inefficient they are!

2 By using the Lumen Method, a comparison can be made to the effectiveness of each type as indicated by the number of luminaires required.

3 The CU table information can be substituted for a similar luminaire that has no published CU table. This is standard practice in lighting design and is much better than guessing.

4 For example, if the designer was planning to use a Prescolite 7" recessed can with a clear specular Alzak trim outfitted with a 50W PAR30 FL, He might use CU table E (which uses a similar Halo can with a 75W PAR30 Lamp). The lumen value for the 50W lamp would be inserted for the 75W in the Lumen Method Window. As long as the lamp type is the same, the CU table simply reports what percentage of the light actually reaches the WorkPlane. This is handy when finding the CU table which can sometimes be a bit "HOLY GRAILISH".

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Table A

Manufacturer: Lithonia Model: LB240A Lamps:--2 each 4' F40T12 34W Lumens per Lamp: 2,650 Total Lumens: 5,300	Description: This luminaire uses two 4' standard fluorescent T12 tubes, is ceiling mounted, and has a wrap around prismatic lens.
Comparison In a 10' x 15' kitchen with a desired footcandle level of 40, 80% ceiling reflectance, 50% wall reflectance, and 20% floor reflectance: 3 luminaires	Luminaires Per Square Foot Factor 3 luminaires ÷ 150 sq. ft. = .02

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Table B

Manufacturer: Lithonia Model: LB440A Lamps:--4each 4' F40T12 34W Lumens per Lamp: 2,650 Total Lumens: 10,600	Description: This luminaire uses four 4' standard fluorescent T12 tubes, is ceiling mounted, and has a wrap around prismatic lens.
Comparison In a 10' x 15' kitchen with a desired footcandle level of 40, 80% ceiling reflectance, 50% wall reflectance, and 20% floor reflectance: 1.5 luminaires	Luminaires Per Square Foot Factor 1.5 luminaires ÷ 150 sq. ft. = .01

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Table C

Manufacturer: Model: Halo H7-304 Trim: Black Step Baffle Lamps:--1 each 75W R30 Flood Lumens per Lamp: 900 Total Lumens: 900	Description: This luminaire uses one 75W R30 Flood lamp, is a recessed ceiling can, and is rated using a black step baffle trim. This is a very popular luminaire and has been included to show just how inefficient it is. The black step baffle absorbs about half the light the lamp is producing!
Comparison In a 10' x 15' kitchen with a desired footcandle level of 40, 80% ceiling reflectance, 50% wall reflectance, and 20% floor reflectance: 22.8 luminaires	Luminaires Per Square Foot Factor 22.8 luminaires ÷ 150 sq. ft. = .152

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Table D

Manufacturer: Model: Halo H7-426 Trim: Clear Alzak (Specular) Lamps:--1 each 75W R30 Flood Lumens per Lamp: 900 Total Lumens: 900	Description: This luminaire uses one 75W R30 Flood lamp, is a recessed ceiling can, and is rated using a clear Alzak (Specular) trim. This luminaire, while better than the previous one, is still inefficient in comparison to the upcoming combinations.
Comparison In a 10' x 15' kitchen with a desired footcandle level of 40, 80% ceiling reflectance, 50% wall reflectance, and 20% floor reflectance: 11.9 luminaires	Luminaires Per Square Foot Factor 11.9 luminaires ÷ 150 sq. ft. = .079

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Table E

Manufacturer: Model: Halo H7-426 Trim: Clear Alzak (Specular) Lamps:--1 each 75W PAR30 Flood Lumens per Lamp: 1,030 (Halogen) Total Lumens: 1,030

Description: This luminaire uses one 75W PAR30 Halogen Flood lamp, is a recessed ceiling can, and is rated using a clear Alzak (Specular) trim. This luminaire is the most efficient of the three incandescent cans rated here. This luminaire is a good choice for general lighting when short range budget is a constraint. Use one of the Epact rated halogen lamps for best efficiency and energy compliance.

Comparison In a 10' x 15' kitchen with a desired footcandle level of 40, 80% ceiling reflectance, 50% wall reflectance, and 20% floor reflectance: 7.8 luminaires

Luminaires Per Square Foot Factor 7.8 luminaires ÷ 150 sq. ft. = .052

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Table F

Manufacturer: Model: Prescolite CFV26-892 Trim: Clear Alzak (Specular) Lamps:--1 each 26W Double Twin Lumens per Lamp: 1,800 Total Lumens: 1,800

Description: This luminaire uses one vertically positioned 26W Double Twin compact fluorescent lamp, is a recessed ceiling can, and is rated using a clear Alzak (Specular) trim. Though this luminaire is far more efficient, in the long run, than the three incandescent cans shown previously, the lamps' vertical position is considered by more than a few designers as ugly. For an aesthetic improvement and greater efficiency, refer to the two following compact fluorescent luminaires.

Comparison In a 10' x 15' kitchen with a desired footcandle level of 40, 80% ceiling reflectance, 50% wall reflectance, and 20% floor reflectance: 7.2 luminaires

Luminaires Per Square Foot Factor 7.2 luminaires ÷ 150 sq. ft. = .048

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Table G

Manufacturer: Model: Prescolite CFR818-492 Trim: Clear Alzak (Specular) Lamps:--2 each 18W Double Twin Lumens per Lamp: 1,250 Total Lumens: 2,500

Description: This luminaire uses two horizontally positioned 18W Double Twin compact fluorescent lamps, is a recessed ceiling can, and is rated using a clear Alzak (Specular) trim. The most energy efficient and, over the long run, most cost effective luminaire design. The horizontal orientation of the lamps avoids the unsightliness of the previous luminaire while providing more light through the use of an extra lamp. The only decision between this and the next unit is how many fixtures the designer wishes in the ceiling.

Comparison In a 10' x 15' kitchen with a desired footcandle level of 40, 80% ceiling reflectance, 50% wall reflectance, and 20% floor reflectance: 5.9 luminaires

Luminaires Per Square Foot Factor 5.9 luminaires ÷ 150 sq. ft. = .039

NOTE:
The above fixture features twin ballasts that can be wired independently. By connecting each of the lamps in each of the cans separately to two different switches, a hi-low dimming effect can be achieved.

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Table H

Manufacturer: Model: Prescolite CFR826-492 Trim: Clear Alzak (Specular) Lamps:--2 each 26W Double Twin Lumens per Lamp: 1,800 Total Lumens: 3,600

Description: This luminaire uses two horizontally positioned 26W Double Twin compact fluorescent lamps, is a recessed ceiling can, and is rated using a clear Alzak (Specular) trim. The most energy efficient and, over the long run, most cost effective luminaire design. The horizontal orientation of the lamps avoids the unsightliness of vertically oriented compact fluorescent lamps while providing more light.

Comparison In a 10' x 15' kitchen with a desired footcandle level of 40, 80% ceiling reflectance, 50% wall reflectance, and 20% floor reflectance: 4.4 luminaires

Luminaires Per Square Foot Factor 4.4 luminaires ÷ 150 sq. ft. = .029

NOTE:
The above fixture features twin ballasts that can be wired independently. By connecting each of the lamps in each of the cans separately to two different switches, a hi-low dimming effect can be achieved.

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