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Chris Rush's profile - activity

2018-06-11 09:51:03 -0500 answered a question illegal variable name

Looks like you're missing the multiplication operator throughout your rcalc command. Add the * any time you need to mult

2018-06-07 09:02:48 -0500 edited answer Radiance command not found

Regarding line 16, it looks like you have an extra space at the end of line 15 that means the backslash isn't properly e

2018-06-07 09:02:04 -0500 answered a question Radiance command not found

Regarding line 16, it looks like you have an extra space at the end of line 15 that means the backslash isn't properly e

2017-09-18 08:41:23 -0500 commented answer Learning Resources for Photometry, Radiometry, Optics

I've always considered Erco's Handbook of Lighting Design to be like a condensed version of the IES handbook - with obvi

2017-05-09 10:59:31 -0500 commented question LightLouver never showing savings

Instinctively it wouldn't surprise me if the LL impact in a 10ft high and 30ft deep room is primarily to mitigate some o

2016-06-10 08:29:13 -0500 commented question Leaves Simulation

What climate are you in, and what species of plants are likely? Will the leaves still be there in winter, or will they fall off and allow more direct sun through in winter? Also, I don't know, but would be curious if leaves are opaque to infrared. Depending on the species and thickness of leaves some are opaque to light, but others with thin leaves have a slight bit of green translucency.

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2015-08-21 09:38:47 -0500 answered a question State-of-the-art lighting design?

For aggressive lighting power reductions, it's not a question of "state of the art" but rather what are the lowest illuminance levels an owner will consider acceptable, while also deemed satisfactory to occupants on multiple levels of visual and functional experience. Current technologies are a fairly level playing field and you can't say for certain that deploying technologies X, Y, and Z will give performance A.

In addition to "how low can you go" it's also a question of where each criteria is deemed necessary, either as a blanket of uniform light across entire spaces, or if limitation of enhanced lighting at particular work areas will be accepted.

I agree with a previous response (although I'm admittedly biased) that verification of targets by a lighting designer are the only way to determine a project specific answer.

2015-08-20 13:41:54 -0500 answered a question Is it reasonable to use Simple Glazing System Window Materials object to recreate a Double-pane glass windows?

Also, if you're doing more detailed daylighting simulations using Radiance, and the precision of the angular dependence is important, you may need to consider more complexity of the glass itself. Refer to this post: https://unmethours.com/question/1037/...

2015-08-20 13:41:54 -0500 commented answer Converting transmittance to transmissivity for IGUs

So is the BRTDfunc from the glaze script still better (presumably more processor efficient) than the two glass surfaces?