task lighting

Vivian,

Task lighting is generally defined as specific lighting either under a cabinet or from a plug source (like a desk lamp) or something similar. From what you described, you'll have to count that as area lighting and include it in any LPD calculations. In this case, ASHRAE takes precedence over the CI Guide book, and the relevant portion of the section you quoted is "furniture-mounted". With that in mind, ceiling mounted controllable lights do not qualify for task lighting status.

Hope this helps clear up the confusion,
Paul

If you look in ASHRAE 90.1 Appendix G, it gives you the factors you can use for using daylight dimming and/or occupancy sensors. They generally run around 10%. If you need to lower your LPD by more than that, then you'll need to examine other methods of reducing your lighting load.

Our project is in Israel where code requires a minimum of 600 Lux in office spaces. We have installed furniture mounted task lighting controlled by automatic shut-off (9.2.2.3.p) and a control device integral to the luminaire (9.4.1.4.d) so that the task lighting does not need to be included in the calculation of the interior lighting power allowance. Using this exemption, our LPD is just over 35% below ASHRAE 90.1, providing us with 5 points. If the task lighting is included, we have a savings of just over 26%, qualifying us for 3 points.

We are seeking IEQc6.1 and the review comments indicate that the task lighting must be included. The review team has requested additional documentation (plans) to demonstrate compliance with IEQc6.1.

The reference guide for IEQc6.1 (referenced above) actually states that "To comply with ASHRAE 90.1-2007, task lighting must be included in the lighting allowance for EAp2 and EAc1.2." However, ASHRAE 90.1 specifically exempts the fixtures we have installed, and the wording says references compliance with ASHRAE rather than a LEED credit requirement. EAp2 does not appear to specifically require inclusion of these fixtures. EAc1.1 specifically states (reference guide p. 155, calculations line 3) that Section 9.2.2.3 specifically lists lighting equipment that is exempted from consdieration in determining the LPD and therefore does not need to be included in the calculation.

To make matters more complicated, we have submitted with 80 points and target Platinum certification. We have not used EAc4, so still have some cushion available.

Question: Does pursuit of IEQc6.1 exclude utilization of the ASHRAE 90.1 9.2.2.3 exemption? I'd rather use EAc4 to purchase a point than risk an appeal of EAp2 and potential loss of 2 points.

Another question: I understood that as EAc1.2 provides credit for occupancy and daylight sensor reductions these can not be included in the LPD calculations for EAc1.1. Is this correct?

Sorry - I'll answer my own question. Looks like I didn't read the full review comments today.

The Technical Advice states "or provide confirmation that the task lighting complies with ASHRAE 90.1-2007 9.2.2.3.p.

Sorry to bother everyone (but now you know the answer.)