Parking Lot Lighting
IES RP-20 compliant design with zero light trespass — from 50-space retail lots to 1,000+ space commercial facilities.
This guide covers everything contractors, property managers, and facilities directors need to design a code-compliant, energy-efficient parking lot lighting system. You will find IES RP-20-14 illuminance standards, independent LM-79 performance data for the OT Series (75W–420W), BUG rating compliance tables, light trespass control strategies, and real ROI calculations — all based on verified test reports and published standards, not marketing claims.
What We Hear
Common Parking Lot Lighting Challenges
"Last year we had 3 slip-and-fall lawsuits. Our insurance carrier is threatening a 40% rate increase unless we upgrade the lighting."
— Property Manager, 180-space retail center, Orange County CA
"The poles were poured 6 inches off-plan. When we hung the fixtures, the beam pattern missed half the driving aisle. The owner refused to accept it."
— Electrical Contractor, San Bernardino CA
"The neighbor filed a complaint — our parking lot light was shining into her bedroom. We got a code violation with a 30-day cure deadline."
— Facilities Director, medical office complex
Photometric Layout
Parking Lot Lighting Design — Plan View
Typical 100-space commercial lot showing optic selection by pole position, spacing, and light trespass boundary.
Plan View — 100-Space Commercial Parking Lot · OT 145W · 25ft Poles
Design Standards
IES RP-20-14 — Parking Facility Lighting
| Facility Type | Min Horizontal (fc) | Uniformity Max:Min | Min Vertical (fc) | CRI Min |
|---|---|---|---|---|
| Open Lot — Basic | 0.5 fc (5 lux) | 4:1 | 0.1 fc | 50 |
| Open Lot — Enhanced Security ★ | 1.0 fc (10 lux) | 4:1 | 0.25 fc | 50 |
| Covered Garage — Basic | 1.0 fc (10 lux) | 4:1 | 0.25 fc | 50 |
| Covered Garage — Enhanced | 5.0 fc (50 lux) | 3:1 | 1.0 fc | 65 |
| Entrance / Exit | 5.0 fc (50 lux) | 3:1 | 1.0 fc | 65 |
| Stairwells | 5.0 fc (50 lux) | 2:1 | 2.5 fc | 65 |
Source: IES RP-20-14 "Lighting for Parking Facilities", Table 4.1
Why Vertical Illuminance Matters
Most specifications focus on horizontal illuminance — the light on the ground. But vertical illuminance determines whether security cameras can identify faces. IES RP-20 §4.3 recommends vertical illuminance ≥ 25% of horizontal. Without adequate vertical illuminance, cameras capture silhouettes instead of identifiable faces, making surveillance footage useless for prosecution.
Tested Performance
LM-79 Certified Data — OT Series
| Model | Lumens @120V | Lumens @277V | Efficacy | Power Factor | BUG Rating | Report # |
|---|---|---|---|---|---|---|
| OT 75W | 12,551 lm | 12,445 lm | 161–163 lm/W | 0.9958 | B2-U0-G2 | JAE200924-AB |
| OT 145W ★ Best Seller | 21,159 lm | 21,053 lm | 146–151 lm/W | 0.9958 | B3-U0-G3 | JAE200924-AG |
| OT 300W | 46,880 lm | 47,055 lm | 155–163 lm/W | 0.9969 | B4-U0-G5 | JAE200924-AJ |
| OT 420W | 62,482 lm | 61,577 lm | 149–154 lm/W | 0.9969 | B5-U0-G5 | JAE200924-AK |
Source: IES LM-79-08 test reports by Standard-Tech Co., Ltd. (A2LA Accredited), tested at 25°C ±1°C, goniophotometer at 26m. LED: Seoul Semiconductor STW8L8PA.
All models: 100% zonal lumens in 0–90° zone (full downward light). Only 1.4% of lumens in 80–90° zone (minimal high-angle light). U0 across all wattages = physically zero uplight, verified by independent LM-79 testing.
Candela Distribution — 300W OT at 0° Horizontal Plane
Source: IES files AOK-300WOT-NVS-S5-00-5070-T302/T402/T502-P, 0° horizontal plane section.
Key takeaway: Type III peaks at 45° then drops sharply — ideal for perimeter poles where you need forward throw with minimal backlight. Type IV has a flatter distribution for wider coverage. Type V peaks at 65° for maximum spread — use at intersections and central areas. All three reach 0 cd at 90° (full cutoff).
Light Trespass Control
BUG Rating & Dark Sky Compliance
BUG (Backlight-Uplight-Glare) rating per IES TM-15 varies by wattage — more lumens means more total light in each zone. U0 (zero uplight) is consistent across all wattages because the full cutoff housing physically blocks upward light.
| Model | B (Backlight) | U (Uplight) | G (Glare) | Dark Sky E2 | Dark Sky E3 | Dark Sky E4 |
|---|---|---|---|---|---|---|
| OT 75W | B2 | U0 ✓ | G2 | ✓ Meets | ✓ Exceeds | ✓ Exceeds |
| OT 145W ★ | B3 | U0 ✓ | G3 | ⚠ B marginal | ✓ Meets | ✓ Exceeds |
| OT 300W | B4 | U0 ✓ | G5 | ✗ B exceeds | ⚠ B+G marginal | ✓ Meets |
| OT 420W | B5 | U0 ✓ | G5 | ✗ B exceeds | ✗ B+G exceed | ⚠ G marginal |
BUG data from LM-79 reports. Dark Sky zone limits per IDA/IES Model Lighting Ordinance (MLO). E2=Rural, E3=Suburban, E4=Urban.
Mitigation for higher B/G: Add OT Visor accessory to reduce backlight by 40–60%, or use lower wattage with Type III optic on perimeter poles. 75W OT meets even E2 (rural) without modification.
Compliance
Regulatory Compliance
DLC 5.1 Premium
Highest rebate tier. $50–200/fixture from most US utilities.
✓ All OT models listed
UL 1598
Listed for wet locations. Outdoor pole/arm-mounted luminaires.
✓ UL Listed
Title 24 (CA) §140.7
LPD ≤0.14 W/ft². Photocell + dimming required.
✓ OT 300W = 0.063 W/ft² (55% under limit)
IDA Dark Sky
Full cutoff, BUG U0 = zero uplight.
✓ U0 all wattages
ADA Accessibility
Min 10 fc at building entrances and walkways.
✓ Type V optic for entrance zones
NEC 2023
Art. 410 luminaire installation, wiring, grounding.
✓ UL Listed compliance
Field Experience
Common Pitfalls & How OT Solves Them
⚠️ "The poles were poured off-plan"
15% of new construction projects have pole offset errors of 3–12 inches. Conventional fix: crane return at $2,000–4,000 per pole to re-aim fixtures.
✅ OT Solution: 90° field-rotatable optics. Open 4 screws, rotate, re-secure. 15 minutes, $0 cost.
⚠️ "Mixed voltage — half the site is 120V, half is 277V"
25% of retrofit projects encounter mixed voltage circuits. Conventional fix: order two fixture models, double inventory.
✅ OT Solution: NV model (100–277V universal input). One SKU covers both. HV model covers 277–480V.
⚠️ "The owner wants to change color temperature after install"
10% of projects. Conventional fix: return fixtures (15–25% restock fee), re-order, re-install.
✅ OT Solution: DIP switch CCT: 3000K/4000K/5000K selectable. Open driver compartment, flip switch. 5 minutes per fixture.
⚠️ "Light trespass complaint from neighbor"
20% of projects adjacent to residential. Code violation + 30-day cure + potential $500–5,000 fine.
✅ OT Solution: Step 1: Rotate optics to redirect (free). Step 2: Add OT Visor (reduces backlight 40–60%). Step 3: Prevention — spec Type III on perimeter poles.
⚠️ "Title 24 inspector failed the project"
30% of first-time LED retrofits in CA. Top reasons: no photocell, no dimming, LPD over limit.
✅ OT Solution: OT has NEMA 7-pin photocell receptacle (twist-lock) + 0-10V standard dimming + standby ≤0.5W. At 163 lm/W @277V, LPD is 55% below limit.
Recommendation
Recommended Configurations
| Project Scale | Wattage | Optic | CCT | Voltage | Controls |
|---|---|---|---|---|---|
| Small–Medium (<100 spaces) ★ Most Common | 145W | Type IV | 4000K | 100–277V | Photocell |
| Medium (100–200 spaces) | 145–200W | Type III (perimeter) + Type IV (interior) | 4000K | 100–277V | Photocell + 0-10V |
| Large (200–500) | 300W | Type IV | 4000K | 277–480V | DALI + occupancy |
| High-security | 300W | Type V | 5000K | 277–480V | Motion + photocell |
| Residential-adjacent perimeter | 200W | Type III + Visor | 3000K | 100–277V | Photocell + dimming |
Most Popular: OT 145W Type IV, 4000K, 25ft Poles
The 145W is Auvolar's highest-volume area light — the right balance of output and cost for the majority of commercial parking lots under 100 spaces. At 21,053 lumens @277V with 151 lm/W efficacy (LM-79 report JAE200924-AG), each fixture covers approximately 3,000 ft² at 25ft mounting height while comfortably exceeding IES RP-20 minimums.
Spacing: 60–75ft between poles at 25ft height (2.4–3.0× mounting height ratio).
Fixture count: 50-space lot (~20,000 ft²) → 7–8 fixtures at 145W. 100-space lot (~40,000 ft²) → 14–16 fixtures.
For larger lots (200+ spaces): Step up to OT 300W (47,055 lm @277V) for wider spacing and fewer poles — 75–90ft spacing, 17–20 fixtures per 200 spaces.
ROI
Energy & Cost Comparison
| Metric | 1000W HPS | OT 300W LED | Savings |
|---|---|---|---|
| System wattage (actual) | 1,080W | 288.3W (LM-79 @277V) | 73% reduction |
| Annual kWh (12hr/day) | 4,730 kWh | 1,263 kWh | 3,467 kWh |
| Annual electricity ($0.15/kWh) | $710 | $189 | $521/fixture |
| Maintenance/year | $165 (lamp + ballast amortized) | $0 | $165 |
| Total annual savings | — | — | $686/fixture/year |
OT power based on LM-79 tested 288.3W @277V (Report JAE200924-AJ). HPS system wattage includes ballast loss (~8%). Electricity at US commercial average $0.15/kWh.
20-fixture parking lot: $13,720/year savings. With DLC Premium rebate of $100–200/fixture, payback period < 1.5 years.
Product Video
OT Series Overview
Real-World Projects
See OT in Action
CarMax — 240+ Locations Nationwide
Replaced 1,000+ HPS fixtures with OT Series across the entire CarMax network.
The Home Depot — Parking Lot LED Upgrade
Multiple Home Depot locations upgraded to OT Series for energy savings and improved safety.
Kroger Supermarket
Kroger locations standardized on OT Series for consistent, safe parking lot illumination.
Ready to Design Your Parking Lot Lighting?
Get a free photometric layout or a custom quote for your project.