Re: Re: Lighting Design for Kitchen

[Ben McCormack <yahoogroup@xxxxxxxxxxxxxxxxxxx>]

Neil

I am no expert but I think this should help

You need to find out the Lumens output of the bulbs you are using.

http://www.alertelectrical.com/Lamps-And-Tubes/Tungsten-Halogen-Incl-Low-Voltage-And-GU10/Low-Voltage-Dichroic-Lamps-12v/50w-50mm-38-flood-LV-lamp-DIM258B.asp

Initial Lumens : 2000


Don't forget this is the INITIAL light level of the bulb. I assume
this will decrease over time.

If we take a 3m*3m room with 2.4m high ceilings. If I take the above
bulb and put them into Relux and ask it to light the room and give 320
lumens. I think this is measured 75cm above the ground level.

Maintenance factor: for domestic use with LV halogens, set at 0.95 if
using really good lamps; 0.90 if you're using generic ones. - I got
this advice from someone else.


The tool tells us we need to of the above lights to give the required
illumination.

General
Calculation algorithm used Average indirect fraction
Height of evaluation surface 0.75 m
Height of luminaire plane 2.40 m
Maintenance factor 0.90
Total luminous flux of all lamps 4000 lm
Total power 100 W
Total power per area (9.00 m2) 11.11 W/m2 (1.82 W/m2/100lx)
Illuminance
Average illuminance Eav 610 lx
Minimum illuminance Emin 96 lx
Maximum illuminance Emax 6780 lx

I have also attached the complete pdf output.

I am sure I have got lots of this wrong but it is a start.

Regards
Ben


On 30 Dec 2008, at  22:33, Neil Wrightson wrote:

> Hi,
>
> I've found this thread quite interesting as I'm looking at
> refurbishing my
> office and pulling out the 2 sets of 2 floru tube fittings and
> putting in
> down lights.
> When I was in Canada (Sep 2008), I saw some bayonet style of LED
> lights.
> These work directly on 110/240VAC. You just unscrew your filament
> lamp and
> screw in these instead.
> No external LED power supply required.
>
> Have you looked at these at all for your kitchen?
>
> One of the confusing areas I'm having trouble with is comparing
> light (Lux)
> levels.
> I use the term light levels because I know what a 230VAC 40W or 60W
> or 75W
> looks like in my house. What these are in Lux levels?
> Bedside lamps 40W, general room 60W, squeezing pimples 75W/100W :)
>
> Trying to convert this light levels into the required wattage as
> LED's or
> Low voltage Halogens is a task.
>
>
> Regards,
>
> Neil Wrightson.
> <http://geo.yahoo.com/serv?s=97359714/grpId=1109639/grpspId=1705041992/msgId
> =154484/stime=1230646043/nc1=4025304/nc2=5579907/nc3=5202321>
>
>
> [Non-text portions of this message have been removed]
>
>
>



[Non-text portions of this message have been removed]


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