How to Choose Room-Appropriate Lighting Fixtures

I. Core Parameter Analysis

1. Illuminance (Lux)
   Lumens per square meter (1 Lux = 1 lm/㎡). China’s GB 50034 recommends:

Bathroom: 75-150 Lux   | Hallway: 75-100 Lux 
Bedroom: 100-200 Lux  | Living Room: 150-300 Lux 
Kitchen: 200-500 Lux     | Study: 300-500 Lux

     Why: Directly aligns with international standards (e.g., EN 12464), using "Lux" as the universal metric.

1. Total Lumens Calculation
   Formula: Total Lumens = Room Area (㎡) × Target Lux × Maintenance Factor

• Maintenance Factor: 0.7 (accounts for aging and dust)

• Example: 15㎡ study needs 15 × 300 × 0.7 = 3,150 lm

2. Wattage Estimation
   Modern LEDs achieve 120-150 lm/W efficiency.
   Wattage ≈ Total Lumens ÷ Efficiency

• Example: 3,150 lm ÷ 120 lm/W ≈ 26W

II. Room-Specific Lighting Plans

▶ Living Room (Central Zone)

💡 Pro Tip: Use deep anti-glare downlights (UGR<19) and RGBW strips for scene transitions.

▶ Kitchen (Safety-Critical Area)

❗ Key: >500 Lux for prep areas; Ra>90 CRI ensures food safety.

▶ Bedroom (Layered Lighting)

• Light Distribution:

- Base Lighting: 40%

- Bedside Reading: 30%

- Night Light: 15%  

- Wardrobe: 15%

• 
  

• Bedside Lamp: 2700K with 10%-100% dimming

• Smart Control: Motion-activated footlights (<5 lm)

▶ Bathroom (Wet Zone)

III. Advanced Techniques

✅ Anti-Glare Design:

• Honeycomb grid fixtures (UGR≤16)

• Downlight spacing = Ceiling Height × 0.7 (e.g., 2.8m height → 2m apart)

✅ Light Quality Essentials:

• CRI >90 (Ra>97 for art studios)

• R9 >50 (accurate skin/food tones)

• SDCM <5 (color consistency)

✅ Smart Controls:

• DALI System: 0.1% dimming precision

• Presence Sensors: mmWave radar replaces motion sensors

🚀 Industry Trend: EU ErP 2023 mandates LED efficiency ≥105 lm/W. Prioritize L90B10 products (<10% lumen decay at 50k hours).

Golden Ratio Framework

Professional Lighting Selection Rule: Calculate total lumens needed by space function (area × target illuminance × 0.7), then determine wattage using efficient LED efficacy (>120lm/W). Layer lighting in living rooms; maintain >500Lux with Ra90 for kitchen work zones; enable dimming in bedrooms; prioritize waterproof & anti-glare in bathrooms. Key parameters: UGR≤19 (glare control), CRI>90 (high color rendering), SDCM<5 (color consistency).

Build layered lighting with:
60% Base Lighting + 30% Task Lighting + 10% Accent Lighting
Example: For a 20㎡ living room:

• Base: 20 × 150 Lux × 0.7 = 2,100 lm (e.g., 30W ceiling light)

• Task: Reading lamp with 400 lm

• Accent: 200 lm track spotlight

Lighting design is precision management of light – balancing visual function and psychological comfort.