automated blinds at option 2 - greater than 3,000 lux

Hi Emir,

The treatment of blinds has changed significantly in v4. For one thing, you must provide some type of glare control devices in all regularly occupied spaces to meet the credit now, but they don't necessarily need to be automatically controlled. If you're modeling Option 2, the credit language now removes the exemption for blinds that you mention.

For Option 1, as Julien states below, blinds are included in the sDA calculation but not in the ASE calculation. Since ASE is the metric that addresses glare issues, it seems that this credit now requires teams to mitigate glare through other design methods.

Thanks for this discussion! Has anyone seen any Interpretation Requests on this topic? Working on a project where we have automated shades and are curious if any other project has been able to use them in the ASE calc.

Melissa - thanks for pointing this out. Not using automated shades in the ASE calculation is puzzling to me, as that seems like a reasonable way to provide glare control in some circumstances like east- and west-facing facades. And, with the transportation terminal I'm working on right now, having "manual overide" is an interesting requirement as well since it's not clear who would be accepted for control. You can't just make it available to anyone who would walk up to it.

Very helpful discussion thread - thanks to all.
Has there been any change to the automated shades ruling for ASE calculations?

Answering my own question - LI#100002149 addresses it.

Hi everybody,

what it's really strange and doesn't make sense is that the exemption has been applied to the upper limit of ASE 10% (Option 1) but not to the upper limit of Illuminance 3,000 lux (Option 2), even though we're talking about the same things (glare and automated blinds).

Have you any enlightening idea about that?

Many thanks to all.

Ornella

ASE calcs is completely different than illuminance calcs in option 2 in regards to hours and time for measurements. As with any new  version of LEED it is to get the industry to move forward in the way the do things. Since IESNA and the daylighting committee established sDA as the metric to use in the industry, LEED following the lead to push folks, such as more points, towards using that metric for all daylighting simulations.   Now will another LI come around allowing the upper limits to be exceeded for option 2, maybe, new ones come out all the time as more folks dig into LEEDv4.

Thank you Todd.

Ornella