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HomeMy WebLinkAbout005 - Billy DeBuse Lighting analysis Tim Staub From: William DeBuse <William@nrarep.com> Sent: Tuesday, October 26, 2021 10:50 AM To: Tim Staub Subject: RE: Durston lighting job Correct. To bring this area into compliance the existing lighting along Durston would need be replaced. The space is already over illuminated per current requirements. Thanks, Billy From:Tim Staub<tstaub@chengineers.com> Sent: Monday, October 25, 2021 12:35 PM To:William DeBuse<William@nrarep.com> Subject: RE: Durston lighting job Thank you so much for running this analysis, Billy. So essentially it sounds like there would not be much of a benefit or we would not be able to bring this area into current lighting standards compliance by placing a light on the subject property. (The subject property is near the middle of the study, where our survey shows that existing house on the south side of Durston.) Thanks, Tim From: William DeBuse<William@nrarep.com> Sent: Monday, October 25, 2021 12:18 PM To:Tim Staub<tstaub@chengineers.com> Subject: RE: Durston lighting job Hi Tim, I went ahead and looked through this. Based on the picture you sent over and the layout, my best guess is these fixtures are either of the two part numbers: Cree: BXSP-C-HT-2LG-F-**K-UL-SV Cree: BXSP2-HO-HT-2LG-165W-**K-UL-SV I checked with the city's maintenance guy and his record was from the early 2000's so I think these were likely retrofitted at some time. Because I am not the Cree rep, we don't have any record of when these may have been sold so I worked off of current photometric information (which is the only info Cree has publically available anyways...). This should be a pretty good estimate of what the lighting conditions are in the field.The only certain way would be to go out into the field with a light meter as well as take a bucket truck and take one of the fixtures down and check with the manufacturer on lumen output and BUG ratings for that generation of that fixture. Using the current generation of these fixtures and looking at the poles using Google Streetview here are the following things I noticed: 1. Pole height exceeds recommendations (reference Table A and Table B—page 121 and 124 of the DSSP pdf) 1 2. Poles do not appear to have breakaway couplings (Figure 14—page 150 DSSP pdf)—this should be verified in the field 3. Poles are not Hunter Green (Section XII—page 128 DSSP pdf) 4. Fixtures have too high if a B and G of the BUG ratings (Table A and Table B) 5. Fixtures exceed lumen output recommendations (Table B) 6. Fixtures exceed maximum CCT(Table B)—this should be verified in the field 7. The layout exceeds the light trespass requirement of=<0.1FC(Section XILD—page 125) 8. The layout suggests the intersection may not have enough light (Table A) This is applicable to the BXSP but the BXSP2 would be too much light 9. The layout suggests the roadways may have too much light (Table B) 10. The layout suggests the roadways exceed the uniformity requirement (Table B) After looking through what options we would have to retrofit those existing fixtures with something from Lumec, we could remedy some of the points above, namely: 4,6,7,9. We could also resolve 8 by adding a single luminaire to the intersection on the other side. Resolving the light trespass, CCT, and luminance requirements would be a big step to improving the quality of lighting in this area. I've shown that in the purposed retrofit file attached. Retrofitting the existing luminaires would have a material cost of about$400 ea. (cost to distributor—DN—is $320) and should be pretty easy to install in the field. Adding the additional pole and luminaire would have an additional material cost of about$4200 (DN is$3360) and would involve setting the pole and getting power to it. Finally, I can probably do a layout that works within all of the DSSP requirements, however that would involve changing the existing pole locations, changing the existing poles, and increasing the number of installed luminaires. New poles in every location would be less per each than adding one to match the existing because they would be smaller poles, however there would be more of them. If this is a direction we need to go, I'll do a layout and get you an estimate on the material cost. If you have any questions at all, don't hesitate to give me a call. Always happy to help. Thanks, Billy From:Tim Staub<tstaub@chengineers.com> Sent: Wednesday, October 20, 20214:15 PM To: William DeBuse<William@nrarep.com> Subject: RE: Durston lighting job Thank you! From: William DeBuse <William@nrarep.com> Sent:Wednesday, October 20, 20214:08 PM To:Tim Staub<tstaub@chengineers.com> Subject: RE: Durston lighting job Hey Tim, 2 I have imported the CAD and looked at the project a bit, but I haven't gotten to crunching everything out yet. I am hoping to dig into this one later this week. Thanks, Billy From:Tim Staub<tstaub@chengineers.com> Sent:Wednesday, October 20, 2021 2:47 PM To:William DeBuse<WilliamCcDnrarep.com> Subject: Durston lighting job Hi Billy, I am just following up on whether you had a chance to look at the 5170 Durston project that I sent you last month. I don't need it for another week or two, but just checking in to see if you had made any progress on it. Thank you, Tim Staub, P.E. 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