Typical distance from luminaire to the edge of an area should not exceed one half of the spacing between adjacent luminaires.see below image for recommended spacing guide: Additionally, to minimize glare, the recommended aiming point distance should never exceed twice the mounting height. As an approximation, the average CBU of all the floodlights in an installation should fall within the range of 0.60 to 0.90.

See below image.

Let's do a lighting calculation for a 10 by 12 foot kitchen as an example. It might seem tricky at first but luckily there are lighting tables available that list how much light is required for various room types and tasks. IES 7 = NEMA type 7. shown values are the recommended minimum height (exceptions may be taken when diffuse lens or lamp is specified).

Luminaires located at or near the sides of an area should be IES type 2, 3 or 4 depending on the coverage, intensity and uniformity required. For our basic general kitchen lighting, we know from the table above that we'll need 20-50 footcandles. If you are using a very small screen or smart phone, rotate your device to landscape view to read the table below. To achieve the variation in light level required between the general kitchen lighting level and the food prep lighting level, you can group your lights on a few different switches. For our brightest light requirement of 12,000 lumens, the calculation would be: 12,000 lumens / 1200 lumens per bulb = 10 bulbs. The lighting tables you'll be referencing will tell you how much light you need for each room or task in either footcandles (imperial measurements) or lux (metric). The other is lumens. The lighting layout tool works for both large indoor warehouse or industrial spaces -- using LED high bay lights, as an example, as well as outdoor LED flood light … It is equal to the number of degrees between the 10% of maximum candlepower (near the center of the beam) locations.

I.e. Note: The lighting calculation example below is calculated using the imperial system (feet). Lighting wide open areas such as construction sites, railway marshalling yards, ship yards, docks, airport aprons, parking areas and filling stations. For the maximum foot prep level of 100 footcandles, the calculation would be 100 footcandles X 120 square feet = 12,000 lumens. This new, web-based tool eliminates hours of lighting calculations – and the potential for mistakes – by doing the math for customers. So in order to calculate your lighting needs for a given room, you check an illumination chart for the optimal number of footcandles or lux for a given task and then multiply by the square footage (or metres) of the room to obtain the number of required lumens. Since the 10% locations are generally near the edge of a floodlight’s beam, the illumination at the edge is 1/10 or less of that at the beam center. To get the number of lumens the calculation is 2.4 x 538 = 1291 lumens.

Beam lumens are defined as the quantity of light that is contained within the beam limits described as.

A standard 40-watt (40W) bulb is equal to 400+ lumens. Aiming point = 2/3 across distance to be lighted = 2/3 (40 ft.) = 27 ft. aiming point, Basic Electrical Design Course – Level II, Basic Electrical Design Course – Level III, Grounding System Design Calculations Course, Lightning-1: Introduction to Lightning Protection System Design, Lightning-2: Lightning Protection System Design and Calculations, Advanced Course for Lighting Design - Level I, Introduction to Electrical Motors Basics Course, Wiring Diagrams and Calculations for HVAC Systems Course, Electrical Shop Drawings Course – Level I, Power Factor Correction Calculations Course, Electrical Water Heaters Calculations Course, Elevator Traffic and Motor Power Calculations Course, Fluorescent and Incandescent Light Fixtures Inspection Course, Outdoor Lighting Design Calculations – Part One, Outdoor Lighting Design Calculations – Part Two, Outdoor Lighting Design Calculations – Part Three, Outdoor Lighting Design Calculations – Part Four. This page will teach you how to calculate lighting levels.
For some however, this level of 12,000 lumens may be simply too bright. Compare the light level of that room to the tasks shown in the table above. Lighting Calculation - Step 3 Work out how many bulbs you need.

So for our lowest light requirement of 2400 lumens, the calculation would be: 2400 lumens / 1200 lumens per bulb = 2 bulbs. Illuminance on horizontal surface but at angle to luminaire. Illegal Internet copies will be detected by Copyscape. Leave a comment to help all for better understanding. Part one: Design Procedure for The beam-lumen method as per IES method. For those using feet, one footcandle is equal to 1 lumen/square foot. This is exactly the kind of Lighting that I'm talking about. If a pole is 20 feet high, the vertical aiming point should not exceed 40 feet out. If you're working in feet, calculate the area in square feet and use the footcandle value from the light table.

So how many lumens do you need for outdoor lighting? Environmental lighting such as lighting of parks, gardens, sea shores, monuments and historical sites. Illuminanceon a tilted or sloped surface. For a more personalized home lighting design, do a few quick calculations in your current home to determine the light level in a given room. Compare this number to the chart above to get a feel where in each range you prefer your lighting. Now to calculate the required lumens for the kitchen we multiply the number of footcandles (let's take the dimmest general lighting level of 20 footcandles first) by the square footage. For food preparation, we'll want more like 50 to 100 footcandles.
A lumen measures the amount of light that comes from a bulb.

Candela: One candela is equivalent to the illumination from one standard candle. No part of this web site may be reproduced or copied without written permission. Trace intersection of CU ratio to left, determining 0.46 (percentage of bare lamp lumens on area) , then : CU = 0.46.

To obtain reasonable uniformity, the beams of individual floodlights must overlap each other as well as the edge of the surface to be lighted.

Follow 2.5 ratio curve to street side (front) CU curve. The total factor may vary from .65 to .85 depending on the type of lamp and luminaire used, and may include losses due to lamp orientation or “tilt.”. Environmental lighting such as lighting of parks, gardens, sea shores, monuments and historical sites.

For this we'll need 20 footcandles X 120 square feet = 2400 lumens. The number of lumens that a light bulb emits is usually labelled on the packaging. One footcandle is the amount of illumination on a surface created by a light source of one candela that is a foot away from the surface. Thus narrow-beam floodlights are preferable where they will provide the necessary degree of uniformity of illumination and the proper footcandle level. Below the table you'll find an example home lighting calculation for a kitchen. The percentage of beam lumens falling outside the area to be lighted is usually lower with narrow-beam units than with wide-beam units. The greater the distance from the floodlight to the area to be lighted the narrower the beam spread desired.

By multiplying the length and width of our kitchen together we get 10 feet X 12 feet = 120 square feet. The IES beam spreads indicate the angular ranges (horizontally and vertically) through which the intensity of the floodlight is greater than 10% of its maximum intensity.

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