Under the various energy efficiency schemes for commercial lighting upgrades, ASAP can provide a Maintained Illuminance report for the lighting upgrade.
The following columns are available in the report
|Name of space||Name given to the space. This value comes from a question in the upgrade area|
|Class of task conducted in this space(Refer to Table 3.1 of AS/NZS 1680.1:2009)||This value also comes from question in the upgrade area and corresponds to a valid AS/NZS 1680.1:2009 Class of Task. Refer to “Class of Task” table below.|
|Required maintained illuminance||This is the maintained illuminance level specified for the relevant class of task undertaken in the space by Table 3.1 of AS/NZS 1680.1:2006. Refer to “Class of Task” table below.|
|Recommended re-lamping point (RRP) (in hours)||This is the number of operating hours before replacement of the light fittings or lamps is recommended. APs must specify to the Energy Consumer the number of hours of operation before replacement of the light fitting is recommended to maintain compliance with Table 3.1 of AS/NZS 1680.1:2006.|
|Lumen depreciation factor at RRP||This figure represents the amount of lumen depreciation expected to have occurred when the light fittings have reached the RRP based on the relevant photometric data associated with those products (i.e. the lumen depreciation graph/data). The lumen depreciation factor is expressed as a decimal figure < 1 representing the remaining light output at the RRP (i.e. and anticipated 25% lumen depreciation at the RRP would be expressed as 0.75).|
|Other light loss factor||This figure expresses the light loss attributed to sources other than the lumen depreciation of the lamp itself. This includes the expected impact of the dirtying of the luminaire based on the activity undertaken in the space (accounting for the anticipated maintenance regime) by the time the RRP is reached. Like the lumen depreciation factor, this is expressed as a decimal figure < 1 representing the remaining light output at the RRP based on reductions caused by other light loss factors. ie. a space anticipated to experience a 40% reduction in light output due to dirtying of the luminaire and other reflective surfaces would have an OLF of 0.6.|
|Light loss factor (as at RRP)||The overall light loss factor incorporates the nominated lumen depreciation and other loss factors. It is expressed as a decimal < 1 and represents the percentage of the original lumen output that is anticipated will remain at the RRP.|
|Target lux report value for space at time of installation||This is the lux level that the space would be required to meet at the time of installation, based on the light loss factor, to be compliant with the relevant section of AS/NZS 1680.1:2006|
|Reported lux value for space||This the lux level as reported by the lux report conducted in this space.|
|Apparent Compliance||This field shows a value based on whether the reported lux value for the space exceeds the target lux report value.|
Column - Class of task conducted in this space
This value is selected from a question in the upgrade area. The question is usually labelled as ‘What is the type of Task/Activity in the space, for AS1680 purposes?’. The question will contain a list of values from the below table.
AS/NZS 1680.1:2006 Table 3.1 - Recommended maintained illuminances for various types of tasks, activities or interiors
Column - Required maintained illuminance
The required maintained illuminance value is populated automatically by looking up the ‘Recommended maintained illuminance lx’ value in the above table based on the selected ‘Class of Task’. This value, know as RMI, is the required minimum lux level for the space in order to comply with AS/NZS 1680 requirements.
Column - Recommended re-lamping point (RRP) (in hours)
This value is calculated by determining the number of hours in which the lumen output will have depreciated to the point where the lux levels no longer meet the ‘Required maintained illuminance’.
To determine this value, the lumen depreciation for the lamps first needs to be determined. Refer to the Lumen Depreciation Graphs below for details on how the lumen depreciation is determined and plotted over the lifetime of the product.
The RRP is determined by looking at the intersecting point on the graph between the lumen depreciation curve and the ‘Required maintained illuminance value’.
In the above chart we can see after 15,512 hours the lumen depreciation is at 80% of the installed reported lux value of 200. So, after 15,512 hours the maintained illuminance is expected to be 160 lux. (200 * 0.8). As per table 3.1 above, the minimum required lux for AS/NZS1680 compliance for the selected ‘Class of Task’, (Normal range of tasks and work places – Simple) is 160 lx. This intersecting point gives us the Recommend Re-lamping point (RRP).
Column - Lumen depreciation factor at RRP
This value is the lamp lumen maintenance factor (LLMF). The details of how this value is calculated can be found below in ‘Lumen Depreciation Graphs’.
Column - Other light loss factor
This is a calculated value based on information provided in ASNZS1680.4-2017 (Maintenance of electric lighting systems).
There are multiple additional factors that attribute to light loss other than the lumen depreciation. These include:
- Lamp Survival Factor (LSF)
- Luminaire Maintenance Factor (LMF)
- Room surface Maintenance Factor (RSMF)
The total other light loss factors (OLF) is determined by multiplying the above factors.
OLF = LSF x LMF x RSMF
Lamp Survival Factor (LSF)
ASAP assumes a Lamp Survival Factor of 1 for LEDs.
The Luminaire Maintenance Factor (LMF)
The Luminaire Maintenance Factor (LMF) factor represents the build-up of dirt on lamps and luminaires between cleaning.
The LMF value can be determined from table B1 of ASNZS1680.4.
The ASNZS1680.4 table B1 specifies 3 environment types, Clean, Normal and Dirty.
The table below details the relationship between the environment types in ASAP and the environment types in ASNZS1680.4 and the corresponding averaged values used for the LMF.
|ASAP Environment||ASNZS1680.4 Environment||LMF in ASAP||LMF in ASNZ1680.4(average of values for bare,IP4X, IP5X, IP6X lamps)||Cleaning Schedule|
The Room surface Maintenance Factor (RSMF)
The Room surface Maintenance Factor (RSMF) factor represents the film of dust that deposits on all room surfaces causing depreciation in the reflection and transmission factors of the light in the room.
The LMF value can be determined from table B3 of ASNZS1680.4.
The ASNZS1680.4 table B3 also specifies 3 environment types: Clean, Normal and Dirty.
The table below details the relationship between the environment types in ASAP and the environment types in ASNZS1680.4 and the corresponding averaged values used for the RSMF.
|ASAP Environment||ASNZS1680.4 Environment||RSMF in ASAP||RSMF in ASNZ1680.4(medium room with direct luminaire flux distribution)||Cleaning Schedule|
Other Light Loss Factor (OLF) Calculation
Total other light loss factor (OLF) calculations used in ASAP can been in the table below.
|Environment||OLF = LSF x LMF x RSMF(ASAP)||OLF = LSF x LMF x RSMF (ASNZS1680)||Calculated Dirt Factor (DDF)*||Cleaning Schedule|
- Refer to DDF calculation in ‘Lumen Depreciation Graph’
Column - Light loss factor (as at RRP)
This value is the combined lamp lumen maintenance factor (LLMF) and Other Light Loss Factor (OLF).
It is calculated using LLF = LLMF x OLF and represents the overall lumen depreciation of the lamp.
Column - Target lux report value for space at time of installation
This value represents the required target lux at the time of installation to ensure that lux levels will remain above the required maintained illuminance until the Recommended Re-lamping Point (RRP) is reached. This value is automatically populated based on the selected ‘Class of Task’ in AS/NZS 1680.1:2006 Table 3.1 for the upgrade area.
Column - Reported lux value for space
This value is entered via a question by the fieldworker taking the lux readings after the installation has been completed. If multiple lux readings for an area is entered, then the average lux reading will be displayed.
Column - Apparent Compliance
If the ‘Reported lux value’ is greater than the ‘Target lux report value’, then this field will contain ‘Yes’.
If the ‘Reported lux value’ is less than the ‘Target lux report value’, then this field will contain ‘No’.