Parameters Setting for Non Maintained Emergency Lighting

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Ken Tan
Posts: 3
Joined: Thu Oct 06, 2016 1:11 am

Parameters Setting for Non Maintained Emergency Lighting

Post by Ken Tan » Thu Oct 06, 2016 2:59 am

I have following basics questions on how to do the setting when doing the lighting simulation for Non Maintained LED Emergency Lighting with DIALux 4.13:

Q1. In Project Tab: Project Manager>Maintenance plan method: All Inclusive Light loss factor: 0.80, is it still applicable to Non Maintained LED Emergency Lighting? Can we change this to 1.0 since it is a Non-Maintained LED luminaire and the Light loss is very minimum? Any standard guideline I can follow?

Q2. In Project Tab: Project Manager>Room Surface> Reflection Ceiling: 80%; Wall: 50%; Floor: 20%, do we need to change all to 0% since no reflection should be included in the Emergency Lighting Calculation?

Q3. In Project Tab: Project Manager>Light scene: Emergency lighting, do we need to "tick" Include 1st reflection on the ceiling in calc. (LG12) also? What is the standard practise?

Q4. In Output Tab: Project Manager>Emergency Lighting: Light loss factor: 0.72, why is it 0.72 by default? What are the factors that determine this value?

I am looking for the Emergency Lighting industry users to share their experience in doing the simulation with DIALux. Your sharing is very much appreciated.

Thank you very much.

Best Regards,
Ken

kikeblackberry
Posts: 83
Joined: Tue Oct 02, 2012 3:02 pm

Re: Parameters Setting for Non Maintained Emergency Lighting

Post by kikeblackberry » Fri Oct 14, 2016 9:37 pm

Hi, I expect these answers can help you.

A1. EN 1838 is an European Standard that specifies the luminous requirements for emergency escape lighting and standby lighting systems installed in premises or locations where such systems are required.
Those luminous requirements set a minimum average illuminance, in other words it is the value below which average illuminance should not fall. In the other hand, luminaire flux depreciates over the time for all luminaire types due to Ageing of the lamp, Lamp failures, Dirt on the luminaire, Dirt on light reflecting surfaces, etc.
LEDs luminaires have a high maintenance factor like 90% or more but considering 100% it is not a good practice because if maintenance cycle is not taking in account minimum illuminance levels could be overlook and installation will not fit the standard.

A2. No, you don’t. DIALUX do it for you when you tick “light scene is an emergency light scene” in light scene property tab.

A3. In the introduction of the standard EN 1838 on page 2 it is stated that only the direct light has to be taken into account and not the reflected (indirect) component for the calculation of the emergency lighting scene. DIALUX also include the special regulation of the Lighting Guide 12 (LG12) from the SLL in the UK, that the first reflection of direct light onto a ceiling is selectable for the calculation.

A4. Default Light loss factor is defined in File/Settings…/General option/ standard values tab but it can be changed in Project Tab: Project Manager>Maintenance plan method as you described at Q1. It can be calculated as MF = LLMF * LSF * LMF * RSMF. Whereby:

LLMF: Lamp Lumen Maintenance Factor
LSF: Lamp Survival Factor (the lamp's service
life without immediate replacement)
LMF: Luminaire's Maintenance Factor
RSMF: Room Surface Maintenance Factor

Best regards

Ken Tan
Posts: 3
Joined: Thu Oct 06, 2016 1:11 am

Re: Parameters Setting for Non Maintained Emergency Lighting

Post by Ken Tan » Mon Oct 17, 2016 7:21 am

Hi,
Thanks a lot for your answers. Cheers!

Regards,
Ken

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