Research the exemptions in ASHRAE 90.1-2007, Section 9.2.2.3. Many types of performance and high-powered performance lighting (such theatrical lights) are exempt from the calculations. Refer to the additional lighting allowances for artwork, decorative li

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Research the exemptions in ASHRAE 90.1-2007, Section 9.2.2.3. Many types of performance and high-powered performance lighting (such theatrical lights) are exempt from the calculations. Refer to the additional lighting allowances for artwork, decorative lighting, and display lighting listed in Section 9.6.2. 

In a remodeling project, if new lighting is replacing less than 50% of the total installed wattage, the project is exempt from reducing LPD 10% from the ASHRAE 90.1-2007 standard. However, you still must comply with all mandatory requirements for controls

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In a remodeling project, if new lighting is replacing less than 50% of the total installed wattage, the project is exempt from reducing LPD 10% from the ASHRAE 90.1-2007 standard. However, you still must comply with all mandatory requirements for controls and wiring.

The ASHRAE standard refers to “installed” LPD, so all the light fixtures installed during design and construction must be included in the calculation. Often, designs will provide two fixtures to supplement each other at different times. For example, task

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The ASHRAE standard refers to “installed” LPD, so all the light fixtures installed during design and construction must be included in the calculation. Often, designs will provide two fixtures to supplement each other at different times. For example, task lights may be designed to be used only intermittently, but for LPD calculation purposes, you should assume that all lights are switched on. 

The space-by-space method is a good option for projects that do not fit into one of the building type categories or that require increased LPD allowances for either decorative or merchandise lighting. These types of spaces are allowed higher LPDs, but the

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The space-by-space method is a good option for projects that do not fit into one of the building type categories or that require increased LPD allowances for either decorative or merchandise lighting. These types of spaces are allowed higher LPDs, but these increases can only be counted to the extent that they are actually used. ASHRAE allowances are listed in Table 9.6.1 for each space type. 

The building area method allows trade-offs to accommodate for increased LPD in specialized spaces. This is done by intentionally reducing LPD in other areas to meet the whole building LPD allowance. The LPD of those specialized spaces may exceed the allow

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The building area method allows trade-offs to accommodate for increased LPD in specialized spaces. This is done by intentionally reducing LPD in other areas to meet the whole building LPD allowance. The LPD of those specialized spaces may exceed the allowed LPD as long as the whole building LPD is in compliance. 

The building area method is simple and it is an easy one for projects that include only a few space types and can be easily classified as one of the building types listed in ASHRAE, Table 9.5.1. The table refers to a single lighting power allowance for ea

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The building area method is simple and it is an easy one for projects that include only a few space types and can be easily classified as one of the building types listed in ASHRAE, Table 9.5.1. The table refers to a single lighting power allowance for each building type. To determine your project’s performance, compare the total allowable LPD for the building type to the installed LPD of your project. 

The calculation addresses total lighting power use, although it can be determined in two different ways: the building area method or the space-by-space method. Review the ASHRAE LPD allowances and space-type definitions. Consider which approach is most ap

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The calculation addresses total lighting power use, although it can be determined in two different ways: the building area method or the space-by-space method. Review the ASHRAE LPD allowances and space-type definitions. Consider which approach is most appropriate for your project to demonstrate compliance. 

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