Lux Calculation Training - Indoor

LUX CALCULATION TRAINING(INDOOR)

Reference: IESNA Lighting Handbook, 9th Ed.

BY: CAMILO C. AQUINOEE TEAM

OBJECTIVESOBJECTIVES

At the end of the training, attendees will be able to:1. Design indoor lighting calculation using lumen

method.2. Evaluate photometric curves.3. Properly select percentage reflections.

f4. Determine maintenance factors5. Designate minimum lux level

U ff ti it fl t t bl6. Use effective cavity reflectance table7. Use CU tables of various fixtures.

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CONTENTSCONTENTS

1. Notes2. Room data and cavity heights3. Room surface reflectance3. Room surface reflectance4. Luminaire and lamp selection5 Factors affecting calculation5. Factors affecting calculation6. Calculation formula7 Actual excel calculation7. Actual excel calculation

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SOME NOTESSOME NOTES…

1. Establish desired lux levels2. Establish type of luminaire to used in the room3. Lumen method calculates average illuminance3. Lumen method calculates average illuminance

into an area

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STEP 1:STEP 1:

Know your data!y1. Room dimensions & cavity heightsa) Lengthgb) Widthc) Ceiling heightd) hCCe) hRCf) hFCg) Work plane height

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STEP 1:STEP 1:

Know your data!Know your data!2. Room surface percentage (%) reflectance) Ceilinga) Ceilingb) Wall

Flc) Floor* Color shade, surface finish, materials used affects

reflectancereflectance.

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STEP 1:STEP 1:

Know your data!Know your data!3. Room surface Effective reflectance:

) C l l t it ti RCR CCR FCRa) Calculate cavity ratios: RCR,CCR, FCRl = room length

= idth w = room width h = height** h for room cavity ratio hrc for room cavity ratiohcc for ceiling cavity ratiohfc for floor cavity ratiofc f f y

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STEP 1:STEP 1:

Know your data!Know your data!3. Room surface Effective reflectance:

b) Using cavity ratios refer to Figure 9 27 and look forb) Using cavity ratios, refer to Figure 9‐27 and look for effective reflectance values.

c) if luminaire is ceiling surface/recessedc) if luminaire is ceiling surface/recessed mounted, hcc=0

d) if working plane is on the floor h =0d) if working plane is on the floor, hfc=0

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STEP 2:STEP 2:

Know your luminaires!y1. Refer from ITB / Technical Specification2. HID / Fluorescent / Incandescent2. HID / Fluorescent / Incandescent3. Direct / Semi‐direct / Indirect4 Study photometric data4. Study photometric data5. Longitudinal / Transverse6 Lamp lumens6. Lamp lumens

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STEP 2:STEP 2:

Photometric CurvePhotometric Curve Shows the luminous intensity distributionintensity distribution of a lighting device.

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STEP 2:STEP 2:

Figure of a photometric curves in 2D/3D.g p /

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STEP 2:STEP 2:


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STEP 2:STEP 2:


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BREAK?

Next in Line:•FACTORS AFFECTING DESIRED LUX CALCULATION

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STEP 4:STEP 4:

Know the factors affecting your calculation!g y1. CU2. Maintenance factors2. Maintenance factors

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STEP 4:STEP 4:

Determination of CU1. From Step 1: once all reflectance values (

are available, using Figure 9‐28 determine CU g gby selecting the proper luminaire.

2. Interpolate values as required if effective reflectance are not exactly equal in the table

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STEP 4: LIGHT LOSS FACTORSTEP 4: LIGHT LOSS FACTOR

Look at IESNA Lighting Handbook, 9th Ed., page 395

1. Non‐recoverablea. Luminaire ambient temp.

2. Recoverablea. Lamp lumen dep’n.

b. Heat extractionc. Voltage to luminaire

b. Luminaire dirt dep’n.c. Room surface dep’n.

d. Ballast factore. Ballast‐lamp photometricf Eqpt Operating

d. Lamp burnout

f. Eqpt. Operatingg. Tilt h Luminaire surface dep’n.h. Luminaire surface dep n.

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a) Lamp lumen depreciation (LLD) factor Check manufacturers' data for LLD factors. 70% of average rated life is the recommended criterion for lamp

l f b h d l ireplacement for both group and spot re‐lamping programs.

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Fluorescent lamp LLD

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HID lamp LLD

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STEP 4: LAMP DIRT DEPRECIATION (LDD) FACTORSTEP 4: LAMP DIRT DEPRECIATION (LDD) FACTOR

a) Lamp dirt depreciation (LDD) factor Check luminaire maintenance category Check atmosphere Using Figure 9‐17, look for LDD

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STEP 4: LDDSTEP 4: LDD

Lamp Dirt Depreciation (LDD) factor To arrive at categories luminaires are To arrive at categories, luminaires are

arbitrarily divided into sections, a Top Enclosure and a Bottom Enclosure, by drawing a horizontal line through the light center of the lamp or lamps.

The characteristics listed for the enclosures are then selected as best describing the luminaire.

Only one characteristic for the top enclosure and one for the bottom enclosure should beand one for the bottom enclosure should be used in determining the category of a luminaire. Percentage of up‐light is based on 100% for the luminaire.

The maintenance category is determined g ywhen there are characteristics in both enclosure columns.

If a luminaire falls into more than one category, the lower numbered category is usedused.

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or use the below formula: or use the below formula:

where:A and B are found from Figure 9‐18,based on the luminaire maintenancecategory and the atmospherecondition involvedt is time in decimal years (e.g., 1 yr 6mo is entered as 1.5 yr)

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STEP 4: ROOM SURFACE DIRT DEP’N (RSDD)STEP 4: ROOM SURFACE DIRT DEP N. (RSDD)

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STEP 4: LAMP BURNOUT (LB) FACTORSTEP 4: LAMP BURNOUT (LB) FACTOR

The lamp burnout (LBO) factor is the ratio of the The lamp burnout (LBO) factor is the ratio of the number of lamps remaining lighted to the total, for the maximum number of burnouts permitted.for the maximum number of burnouts permitted.

For example, in a room with 100 lamps, 5 lamps are allowed to be burnout without replacingare allowed to be burnout without replacing.

So the factor is 95 out of 100 or 0.95

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STEP 4: FINALLY!STEP 4: FINALLY!

Light loss factor are the product of:Light loss factor are the product of: LLD

LDD LDD RSDD LB

In excel file, just put 0.8

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STEP 5: CALCULATION FORMULASTEP 5: CALCULATION FORMULA

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THANK YOU FOR YOUR TIME!

Lux Calculation Training - Indoor

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