- 22 Oct 2019
Date received: 3 Oct 2019
Date responded: 21 Oct 2019
You asked for
1. We wish to know a) the specific numerical Kelvin (K) colour temperature and lumens brightness scale value of the LED luminaires installed this week to illuminate the A75 within Springholm and b) the specific numerical lumens brightness scale value of the lights these have just replaced.
2. We wish to know to what extent Transport Scotland factored in the emitted light intensity, height, proximity and angle of the LED luminaires in relation to adjacent or opposing habitable rooms of kerbside homes and of their adjacent roadside curtilage.
3. We wish to see a copy of the environmental impact review that we have been advised was undertaken before selection and deployment of these LED luminaires.
4. We wish to know what adjacent private property light trespass surveys, if any, Transport Scotland are prepared to undertake and where complaints of light trespass are submitted and agreed what mitigations including, but not limited to, shading, light beam angle realignment or programmed dimming during the hours when pedestrians are not normally present, are potentially available from Transport Scotland to limit or otherwise reduce the light trespass in question.
5. We wish to know what applicable community/householder consultation policy, if any, exists or is in development that affords or would afford prior consultation before the descision is finally made to install a specific type, location, height, angle or particular lumens value/K value intensity luminaire within the zone of potential light trespass to adjacent property which is not controlled by Transport Scotland.
I have kept the questions numbered for ease of reference
1. The LED lights installed are Signify/Philips Mini Luma with colour temperature – 4000 degrees Kelvin – Neutral White. Lumen output 12 Klumen (81 watt)
2. Lanterns were mounted on existing 8m columns with 0.75m outreach brackets at 5 degree tilt which adheres to industry standards.
3. Please refer to Annex A to this response which is the Trunk Road Maintenance Environmental and Sustainability Considerations document.
4. Lighting calculation comparisons have been prepared based on existing typical 150w high pressure sodium lamp (17 klum) and proposed to demonstrate that new lighting is no worse than existing. Scotland TranServ are carrying out an assessment of the new installations to determine if any adjustment is required and implement reasonably practicable mitigation if deemed necessary.
5. In common with local authorities, it is not policy to consult with the public for lantern replacement works as they are designed in accordance with the Design Manual for Roads & Bridges (DMRB) and BS5489 (Code of Practise for the design of road lighting).
The Scottish Government is committed to publishing all information released in response to Freedom of Information requests. View all FOI responses at http://www.gov.scot/foi-responses.
Please quote the FOI reference
Central Enquiry Unit
Phone: 0300 244 4000
The Scottish Government
St Andrews House