EQ Credit: Interior Lighting (1–2 Points)
👉 “Control it OR improve it—or do both for max points”
👉 This credit is about how lighting feels and functions for people
Not just brightness—but:
- Control
- Quality
- Comfort
🎯 Intent
To promote occupants’ productivity, comfort, and well-being by providing high-quality lighting
⭐ Same 3 keywords again → productivity, comfort, well-being
🔑 TWO OPTIONS
Option | Focus | Points |
Option 1 | Lighting Control | 1 point |
Option 2 | Lighting Quality | 1 point |
Both | Control + Quality | 2 points |
🎛️ OPTION 1: LIGHTING CONTROL (VERY TESTABLE)
📊 REQUIREMENTS
Space Type | Requirement |
Individual spaces | ≥ 90% must have controls |
Shared spaces | 100% must have controls |
🔹 CONTROL FEATURES
- At least 3 lighting levels/scenes:
- On
- Off
- Mid-level
👉 “90–100–3”
- 90% individual
- 100% shared
- 3 levels
⚠️ COMMON TRAP
- Shared spaces are NOT 90% → they are 100%
✨ OPTION 2: LIGHTING QUALITY (SELECT 4 OF 8)
👉 Projects must meet ANY 4 strategies
📊 LIGHTING QUALITY STRATEGIES (SIMPLIFIED)
🔹 PERFORMANCE + VISUAL COMFORT
Strategy | Requirement | Exam Tip |
A | Luminance < 2,500 cd/m² | Glare control |
B | CRI ≥ 80 | ⭐ Very important |
C | Life ≥ 24,000 hours | LEDs (L70) |
🔹 LIGHT DISTRIBUTION
Strategy | Requirement | Exam Tip |
D | Direct-only lighting ≤ 25% | Reduce glare |
🔹 SURFACE REFLECTANCE
Surface | Requirement |
Ceiling | 85% |
Walls | 60% |
Floor | 25% |
👉 Furniture:
- Work surfaces: 45%
- Partitions: 50%
🔹 LIGHT BALANCE (RATIOS)
Strategy | Requirement |
Wall ratio | ≤ 1:10 |
Ceiling ratio | ≤ 1:10 |
👉 Prevents uneven lighting
🧠 MEMORY STRUCTURE
👉 Think in 4 groups:
- Glare → 2,500 cd/m²
- Color → CRI ≥ 80
- Life → 24,000 hrs
- Distribution + Reflectance + Ratios
⚠️ COMMON EXAM TRAPS
Trap | Reality |
Must meet all 8 strategies | ❌ Only 4 required |
CRI optional | ❌ Often tested |
Reflectance ignored | ❌ Very testable |
Direct lighting unlimited | ❌ Max 25% |
Controls only for individuals | ❌ Also for shared spaces |
🧠 SUMMARY
👉 Option 1 = Control lighting
👉 Option 2 = Improve lighting quality
👉 Best projects = Do both
Requirement | Key Number |
Individual controls | 90% |
Shared controls | 100% |
Lighting strategies | 4 out of 8 |
Direct lighting limit | ≤ 25% |
CRI | ≥ 80 |
Lighting levels | 3 (on/off/mid) |
Official FAQs
What percentage of individual occupant spaces must have lighting controls?
B. 80%
C. 90%
D. 100%
✅ Answer: C
💡 Explanation
Under EQ Credit: Interior Lighting (Option 1 – Lighting Control):
• At least 90% of individual occupant spaces must have individual lighting controls
👉 These controls allow occupants to adjust lighting based on their needs and preferences.
⚠️ Exam Tip
• 90% = individual spaces
• 100% = shared multioccupant spaces
What is the minimum CRI requirement?
B. 70
C. 80
D. 90
✅ Answer: C
💡 Explanation
Under Option 2: Lighting Quality:
• Light sources must have a Color Rendering Index (CRI) ≥ 80
👉 CRI measures how accurately colors appear under lighting.
⚠️ Exceptions (Exam Favorite)
• Colored lighting (e.g., theatrical)
• Site lighting
• Specialty applications
A project provides lighting controls for 90% of shared spaces. Does it comply?
B. No
C. Only for residential
D. Only if CRI is met
✅ Answer: B
💡 Explanation
LEED requires:
• 90% for individual spaces
• 100% for shared multioccupant spaces
👉 Since only 90% of shared spaces have controls → ❌ NOT compliant
⚠️ Exam Trap
👉 Students often confuse:
• Individual (90%)
• Shared (100%) ← stricter requirement
A design uses only direct overhead lighting for 40% of the load. What is the issue?
B. Too much indirect lighting
C. Exceeds 25% limit
D. Violates CRI requirement
✅ Answer: C
💡 Explanation
Under Lighting Quality Strategy D:
• Direct-only overhead lighting must be ≤ 25% of total connected load
👉 40% > 25% → ❌ exceeds limit
🎯 Why this matters
• Too much direct lighting → glare + discomfort
• LEED promotes balanced lighting design
A project provides controls but no mid-level lighting option. What is missing?
B. Required lighting scenes
C. Reflectance requirement
D. Energy efficiency
✅ Answer: B
💡 Explanation
Lighting controls must include at least 3 lighting levels/scenes:
• ON
• OFF
• MID-LEVEL
👉 Missing mid-level = ❌ incomplete control system
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