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Draw any shape to scale, grid squares are 1 ft.

1:1152

Drag a corner to move it, or click a wall to set its exact length.

Parameters

Ambient lighting for relaxation

Daylight offsets artificial lighting needs by up to 20%.

Professional Overrides

IES targets: living ≈100–150, bedroom ≈150, kitchen/bath ≈300–500, office ≈500. Overrides the room preset when set.

Enter the exact lumen rating of your fixtures if known.

Light pool at the floor: ⌀ 6.6 ft. Toggle Coverage to see the footprints.

Results

Floor area168.0 ft²
Perimeter52.0 ft
Total lumens2,772
Fixtures placed4
Avg. spacing5.8 ft
Beam pool ⌀6.6 ftoverlapping
Ceiling adjustment+10%

4× 4 inch recessed fixtures at ~700 lumens each, across your floor plan.

Same lumen, zone, cost and product analysis as the Complete Calculator, from your drawn plan.

Lighting Requirements

Floor Area

168.0 ft²

Total Lumens

2,772

Number of Fixtures:4
Fixture Size:4 inch recessed
Lumens per Fixture:700
Lumens per Sq Ft:15
Ceiling Adjustment (9.0 ft):+10%

Recommendations

  • •For a living room, the recommended lighting is 15 lumens per square foot.
  • •Install 4 recessed lights with approximately 700 lumens each.
  • •Total light output: 2,772 lumens for 168 sq ft.
  • •When purchasing fixtures, look for lights rated between 630-770 lumens each.
  • •Spacing between lights should be twice the distance from the wall to the first light.
  • •Your 9.0 ft ceiling raises the required output by 10% versus a standard 8 ft ceiling, already factored into the totals above.

Delivered Light Check

IESNA lumen-method estimate of the maintained light reaching the work plane.

Delivered

82 lux

7.6 fc

Target (IES)

100 lux

9.3 fc

Coeff. of utilisation

0.57

RCR 5

Light-loss factor

0.80

maintained

Below target, 82% of target. This ambient layout delivers below the IES maintained target. For task areas, add the task layer from the layered plan, or increase to about 5 fixtures of this size to meet it with general lighting alone.

* Estimate via the lumen method: E = (N × lumens × CU × LLF) ÷ area. CU is approximated from the room cavity ratio; confirm with the fixture's photometric file (IES file) for a final design.

Layered Lighting Plan

Great rooms layer light. Here's how to split the 2,772 lumens across zones.

Ambient (general)

1,663 lm · 60%

Recessed downlights on a dimmer

Control: Primary dimmer zone, set the base brightness for the room.

Task

416 lm · 15%

Reading floor/table lamps

Control: Separate switch/dimmer so it can run bright independently of mood lighting.

Accent

693 lm · 25%

Wall washers, cove lighting, picture lights

Control: Low-level scene zone, often on a smart scene or timer.

Circuit & Switching Plan

Suggested dimmer zones, connected load and a rough cable estimate for this room.

Switched zoneFixturesLoadControl
Ambient (general)~218 WPrimary dimmer zone, set the base brightness for the room.
Task~15 WSeparate switch/dimmer so it can run bright independently of mood lighting.
Accent~18 WLow-level scene zone, often on a smart scene or timer.

Connected load

31 W

Current @ 230 V

0.1 A

Current @ 120 V

0.3 A

Est. cable

≈ 47 ft

Put each zone on its own LED-compatible dimmer rated above its load above. At 31 W this room sits comfortably on a single dedicated lighting circuit (a typical 15 A/120 V circuit carries ~1,440 W usable; a 10 A/230 V circuit ~1,840 W). Always confirm against local code and have a licensed electrician verify circuits and breaker sizing.

Cost & Energy Estimator

Estimate up-front cost, annual running cost, and the long-term savings of LED over legacy bulbs.

Material cost

GH₵730

GH₵650 – GH₵1,090 (budget–premium)

Installation

DIY · GH₵0

Total up-front

GH₵730

Annual running cost

LED (30.8 W total)

GH₵91.73/yr

44.97 kWh per year

Incandescent (198 W total)

GH₵589.72/yr

289.08 kWh per year

LED saves you

GH₵497.99/yr

GH₵4,979.9 over 10 years

Payback of LED premium

0.2 yrs

CO₂ avoided

97.64 kg

vs. incandescent, per year

* Estimates only. The material cost shown is the typical price; the budget–premium range under it reflects how much fixture choice can swing the bill (e.g. value downlights vs. statement pendants). Energy figures derive from required lumens at typical efficacy (LED ≈ 90 lm/W, incandescent ≈ 14 lm/W). Actual prices, tariffs and grid emissions vary by region.

Product Recommendations

Spec guidance and curated Penlabs fixtures matched to this room.

Colour temperature

2700K – 3000K (warm white)

Warm tones create a relaxing, residential atmosphere for living and resting spaces.

Colour rendering

CRI 80+

CRI 80+ is comfortable and accurate for general living spaces.

Beam angle

Medium 38° – 50° flood

Standard-to-tall ceilings balance coverage and intensity with a medium beam.

Colour temperature preview

2700K
3000K
2700K · warmcool · 6500K

Specify TRIAC/ELV or 0–10V dimmable drivers and a matched LED dimmer. For smart control, choose fixtures compatible with Matter, so they work across Apple Home, Google Home and Alexa.

Shopping List

Project Details

Room: Living Room

Area: 168.0 ft²

Primary Fixtures

4× 4 inch recessed LED recessed lights

  • Minimum 700 lumens per fixture
  • Total lumens needed: 2,772
  • Recommended: 3000K color temperature (warm white)
  • Dimmable preferred
  • IC-rated if near insulation

Installation Hardware

4× Junction boxes (if not included with fixtures)

8× Wire connectors

Electrical wire (14/2 or 12/2 gauge, estimate based on layout)

Controls (Optional)

1× Dimmer switch (LED compatible)

1× Switch plate/cover

Tools Needed

Hole saw (4 inch recessed cut-out)

Stud finder

Fish tape (for running wire)

Voltage tester

Wire strippers and cutters

Drill and driver bits

Estimated Cost

Fixtures (4× selected):GH₵200 – GH₵640
Hardware & Supplies:GH₵200 – GH₵1,100
Total Estimated Cost:GH₵400 – GH₵1,740

* Costs are estimates only. Actual prices vary by brand, quality, and location. Professional installation costs not included.

Installation Notes

  • Space fixtures 70 inches apart (center to center)
  • Keep first fixtures 18 inches from walls
  • Arrange in 2 rows × 2 columns
  • Always turn off power at breaker before working
  • Check local electrical codes and permits
  • Consider hiring a licensed electrician for safety

Generated by Pen Lighting Calculator

by Pen Homes • Professional Lighting Design

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