Hi
I am preparing a LEED project for a jewellery boutique in London. They are purchasing free standing display cabinents with intergral lighting - the cabinets are to be assembled / manufactured with the lighting prior to delivery and instalation on site.
Can I confirm that these unitis will not need to be included under the 'Exceptions listed in 9.2.2.3 of 90.1? As far as it is ... 'Lighting that is integral to equipment or instrumentation and is installed by its manufacturer?
Many thanks
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
November 6, 2020 - 12:10 pm
IMO cabinets are not equipment or instrumentation (this applies to things like manufacturing equipment) so that exception does not apply. This lighting falls under 9.6.2.b.
James Pack
November 16, 2020 - 5:22 am
Thanks... in which can I ask (under 9.6.2 a) is the 1 w/ft2 an allowance or something where we demonstrate that 'lighting for the purpose of decorative appearance' does not exceed 1w/ft2? and if so are we measuring the ft2 of illuminated floor area?
Also in calculating lighting for the purpose 9.6.2.b the general sales areas has multiple product sales zones (less than the total general sales area) how we define the size of them for LEED purposes both in terms of calculating allowance and providing evidence.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
November 19, 2020 - 1:22 pm
Under 9.6.2a you demonstrate that it does not exceed 1W/sf for the spaces that have this additional lighting. So yes the area illuminated.
Under 9.6.2b how you define those areas is up to you, just be prepared to defend the calculation.
Also note that you cannot claim any additional lighting savings. The baseline value for this additional lighting should be the same as the proposed.
James Pack
November 20, 2020 - 11:21 am
Thanks. Could I just confirm your final point.. baseline= to proposed. Are your saying that if our baseline for 9.6.2.b is say 5000w (1600sq.ft x 2.5W+1000w) - That our proposed design cannot exceed 5000?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
November 20, 2020 - 12:14 pm
No. Let me try to be more clear.
This is a prescriptive measure and is not mandatory so you can exceed the baseline allowance. The baseline is limited to no more than the calculated allowance. If the proposed exceeds the calculated allowance then you model the baseline = to the allowance and the proposed as designed. If the proposed is less than the calculated allowance then you model the baseline equal to the proposed.
Let's take your example. Suppose the baseline allowance is 5000 watts. If the proposed design is 6000 watts then you model 5000 in the baseline and 6000 in the proposed. If the proposed is actually 4000 watts then you model 4000 watts in both models.