I have two questions concerning Task Lighting: 1- for an office building, should I count task lighting as process load? 2- For Base-case Simulation, does the LPD limit set by ASHRAE 90.1 include task lighting, or is only concerned with ambient lighting?. And if the task lighting is excluded from the allowed 90.1 limits; how can I show savings using LED task lighting?

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 07/01/2013 - 13:57

1 - Task lighting should be included in your lighting power density values. It is not a process load, it is a lighting load. 2 - The baseline value includes all lighting and does not differentiate between task and ambient lighting. You show savings by designing your overall lighting system to have a lower lighting power density than the baseline. A task/ambient approach is a great way to show overall savings.

Christopher Schaffner

CEO & Founder

The Green Engineer

LEEDuser Expert

630 thumbs up

Mon, 07/08/2013 - 19:50

Don't forget that the task lighting can be ignored if controlled by an occupancy sensor. (90.1-2007, 9.2.2.3, Exception p.)

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 07/08/2013 - 20:03

Just to be clear you can't ignore it entirely. Technically it needs to be included in the energy models as an identical load since all energy uses must be included. You could claim savings for the automatic controls via an exceptional calculation or perhaps just apply the 10% LPD reduction allowance in Table G3.2. If I had automatic controls on my task lights I would ignore Exception p and claim the savings.

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