To determine the needed lumens, you will need to multiply your room square footage by your room foot-candle requirement. For example, a 100 square foot living room, which needs 10-20 foot-candles, will need 1,000-2,000 lumens. A 100 square foot dining room, which needs 30-40 foot-candles, will need 3,000-4,000 lumens.

## How do you calculate lighting cost?

How to Estimate How Much a Light Bulb Costs

- fixture watts = bulb watts × bulb quantity.
- kWh = Power(W) × Time(hrs) ÷ 1,000.
- monthly kWh = kWh per day × 30.
- price = kWh × cost per kWh.

## How many downlights do I need calculator?

A general rule of thumb for spacing your downlights is to take the height of your ceiling and divide by 2. For example, if your ceiling is 8 feet high, then your downlights should be around 4 feet apart from each other.

## Which is mostly used for lighting calculation?

The most common methods used for lighting calculations are:

(2) Lumen or Light Flux Method. This method is applicable to those cases where the sources of light are such as to produce an approximate uniform illumination over the working plane or where an average value is required.

## How many light fittings do I need calculator?

Calculation in 8 steps

- Total wattage of fixtures: Total wattage of fixtures = Number of lamps x each lamp’s watt. Total wattage of fixtures = 2 × 32 = 64 Watt.
- Lumen per fixtures. Lumen per fixtures = Lumen efficiency (Lumen per Watt) x each fixture’s watt. Lumen per fixtures = 85 x 64 = 5440 Lumen.
- Number of fixtures.

18 авг. 2014 г.

## How much does a light cost per hour?

Appliance Electricity Usage

Appliance | Typical Consumption Per Hour | Cost Per Hour (at 10 cents per kilowatt-hour) |
---|---|---|

Electric range burner | 1,000 watts | 10 cents |

Refrigerator | 1,000 watts | 10 cents |

Desktop computer and monitor | 400 watts | 4 cents |

Incandescent light bulb | 60 watts | 0.6 cents |

## How much do LED lights save per month?

Using 10 10W LEDs for 30 days is $. 024 x 10 x 30 = $7.20 per month. Cost Difference: $36 – $7.20 = $28.8 in cost savings each month or $432 – $86.40 = $345.60 every year by switching 10 bulbs from 50W halogens to 10W LEDs.

## How much electricity does a 60 watt bulb use in 24 hours?

So, a 60-watt bulb uses 60 watts hours or . 06 kilowatt hours of energy for each hour it’s on. The bulb would use 1 kilowatt hour in just less than 17 hours if left on continuously; around 12 cents in our current tariff for most residential customers.

## How do I calculate LED lights for a room?

To determine the needed lumens, you will need to multiply your room square footage by your room foot-candle requirement. For example, a 100 square foot living room, which needs 10-20 foot-candles, will need 1,000-2,000 lumens. A 100 square foot dining room, which needs 30-40 foot-candles, will need 3,000-4,000 lumens.

## How many can lights for a 12×12 room?

The typical rule-of-thumb is 24″ from each wall, and then 3-5 feet between cans. So in a 12′ room you’d probably want two rows of lights. Considering it is a bedroom and you don’t need it as bright as a kitchen, you can probably get away with 2 rows of 4 lights for a total of 8.

## How many feet LED lights do I need?

There is no set standard, so one manufacturer may state that there are 250 lumens per foot whereas another states that there are 250 lumens per meter.

…

A Guide on How to Buy LED Strip Lights.

Use | Lumens Required Per Foot |
---|---|

Accent lighting | 150 to 250 |

Under-cabinet lighting | 175 to 550 |

Task lighting near source | 250 to 450 |

Task lighting far from source | 350 to 700 |

## What are the lighting methods?

Lighting methods are classified according to lighting focus, or direction, and fixture arrangement. The light fixture, or luminaire, serves several functions. It must hold the bulb, protect the bulb, protect users from electric shock, and direct and diffuse the light.

## How many lights do I need in a room?

As a handy rule of thumb, a sitting room or bedroom will generally require around 10-20 lumens per square foot, while a bathroom or kitchen will need a stronger level of lighting, at around 70-80 lumens per square foot.

## How do you calculate room Index?

The room index is a number that describes the ratios of the rooms length, width and height. The result of this calculation will be a number usually between 0.75 and 5.

…

How Many Fittings are Required for a Room.

Name | Description |
---|---|

SHR MAX | Used by lighting design software and not needed for manual calculations. |