LightingFree Utility Tool

Lumens & Lighting Calculator — Layered Room Lighting

Calculate total lumens, 3-layer distribution (ambient/task/accent), bulb counts, 90+ CRI specifications, and dimmer load capacity.

Units:

1. Room Purpose & Activity

2. Room Dimensions (Feet)

Length

Width

Ceiling Height

Wall Color Reflectance (LRV)

Standard Bulb Output (Lumens)

Total Target Illumination

4,928 Lumens

Recommended Color Temperature: 2700K (Warm Incandescent Glow)

1. Ambient Layer (50%):2,464 lm (~4 bulbs)

2. Task Layer (30%):1,478 lm (~2 bulbs)

3. Accent Layer (20%):986 lm (~2 bulbs)

Dimmer Load Capacity:55W LED (37% of 150W dimmer)

AI Lighting Simulation

Render this room with 2700K vs 3000K Lighting

Preview accurate ray-traced shadows and layered ambient warmth in our AI Room Designer.

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Architectural Calculation Standard & Methodology

Our Methodology → →

📐 NKBA & IBC StandardsBased on 36" egress clearances & universal spatial codes

🛡️ Zero Retailer Bias100% independent formulas with zero sponsored overrides

⚡ Instant Contractor SpecPrintable and copyable specs for painter and flooring crews

🔒 100% Free & PrivateNo signup, no email gates, calculations run client-side

Lighting Engineering

The 3-Layer Architectural Lighting Principle

Interior designers establish 3 distinct physical planes of illumination to make spaces feel inviting and dimensional:

1. Ambient Plane (50% Output): Diffused chandeliers, cove lighting, or flushmounts providing base walk-around safety.

2. Task Plane (30% Output): Reading table lamps, desk goosenecks, and under-cabinet prep lights focused on work zones.

3. Accent Plane (20% Output): Wall sconces, art picture lights, and uplights drawing the eye to artwork and textures.

Guidance & Clarifications

Frequently Asked Questions

A single ceiling flushmount or ceiling fan light casts unflattering downward shadows under human eyes and facial features while leaving room perimeters dark. Proper lighting requires 3 layers: overhead ambient, eye-level lamps, and wall accents.

2700K mimics classic warm Edison and tungsten incandescent bulbs, producing a relaxing amber glow ideal for living rooms and bedrooms. 3000K is slightly crisper and whiter, ideal for seeing true food colors in kitchens and detail in bathrooms.

CRI measures how accurately light reveals the true tones of paint, wood, and fabrics compared to natural sunlight. Bulbs with CRI < 80 make luxurious beige, taupe, and wood stains look muddy and greenish.

Spatial Planning & Blueprints