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Artificial sky visit ucl

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Artificial sky visit ucl

  1. 1. Artificial Sky VisitContact Peter Raynham (020 3108 9029)Facility The Bartlett Lighting SimulatorAddress University College London, Wates House, 22 Gordon Street, WC1H 0QB. Tel: 020 7679 4853Date of visit Thursday 27th October 2011Purpose of Visit To see the artificial sky and to discuss how it was achieved and how it compares to a real sky. To enquire about lighting MSc Modules. Questions Answers1. Description of the simulator Built in 1998, the artificial sky comprises a large (5.2m diameter) When was the simulator built? geodesic hemispherical dome, covered with an array of state of the art light sources and diffusers. Each of the dome’s 270 energy efficient, compact fluorescent luminaires are individually controlled in order alter the luminance distribution; thereby modelling different sky conditions.2. What lamps are used? The sun is a 50w MR 16 lamp, the sky has 270  Sky 11w compact fluorescent lamps  Sun3. What diffusers are used? The sun is not diffused but uses a 800 mm  Sky diameter parabolic reflector.  Sun The sky luminaires have frosted glass on them and a black internal baffle to stop back reflection4. What Luminance can be achieved? We tend to consider only the illuminace  Sky on the model in the centre and then we are  Sun only concerned in relative measurements5. What is the accuracy of the simulator This depends on what you are trying to when compared to the real world? simulate, but as are not overly concerned  Sky with absolute values then most of the  Sun uncertainties cancel out6. What photometric parameters were see above recreated in the simulator and how?
  2. 2. Questions Answers7. What was the original use for the Used with model buildings originally and now simulator and what is its use now?8. What modifications have been made New camera integrated into the system from the original spec?9. What sky conditions can be simulated? Direct programming supports CIE standard skys, files for any type of sky may be imported10. How is the sky profile programmed? File with a set of luminaire settings11. How is a sky profile simulated? All sky luminaires individually addressable (dimmer switches, filters, change lamps)12. How is the sky profile defined? see 9 (calculated general skies, real data)13. If real sky data was used to define the In principle data from IDMP collection sky profile; how was it collected? stations may be used14. How do the control systems work and Standard DSI (it was build before DALI) how do they interface with the luminaires?
  3. 3. Questions Answers15. How is the Sun simulated? Parabolic mirror16. How are the Seasons simulated? Sun locations and sky settings17. What measuring equipment is used and Multi sensor illuminace meter what is its purpose?18. Can ‘Just Noticeable Difference’ of I am not sure as I am not exactly sure what display screens be assessed in the you mean simulator?19.20.21.22.

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