Auto Dealership Lighting
High-CRI, high-uniformity car lot illumination that makes vehicles look their best — attracting night-time traffic and closing more sales.
Auto dealerships have uniquely demanding lighting requirements: vehicles are vertical surfaces that require both high horizontal and vertical illuminance to render paint colors accurately and attract passing traffic at night. IES RP-33 and DG-19 specify 50 fc horizontal and 30 fc vertical illuminance for front display lots, with CRI 70 minimum and 80+ recommended for accurate color rendering. Poor lighting directly costs sales — customers cannot distinguish colors, metallic finishes look flat, and the lot appears less inviting than a competitor with modern LEDs. The OT Series (145W–420W) delivers up to 163 lm/W efficacy, CRI 70 standard / 80 optional, DLC Premium certification for maximum utility rebates, and 73% energy savings versus 1000W metal halide — with a typical payback period under two years.
What We Hear
Common Auto Dealership Lighting Problems
“At night, all the cars look gray. Customers can't tell the difference between blue and black, or between red and maroon. We lose sales because they can't see the color they want.”
— General Manager, new car franchise dealership, Dallas TX (CRI issue)
“Our monthly electricity bill is $8,000, and at least 60% of that is the parking lot lighting running all night. My regional manager asked why we haven't switched to LED yet.”
— Operations Manager, multi-brand auto group, Phoenix AZ (energy cost)
“The competitor down the street just upgraded to LED. Their lot looks ten times brighter and cleaner. We've seen our evening walk-in traffic drop 20% since they opened.”
— Owner, independent used car dealership, Atlanta GA (competitive disadvantage)
“In the service bay drive-through, technicians complain about not being able to see fasteners clearly. We've had two warranty repair errors and an injury that might have been lighting-related.”
— Service Manager, dealership service center, Los Angeles CA (safety & efficiency)
Design Standards
IES RP-33 / DG-19 — Auto Dealership Lighting Standards
| Zone | Horizontal (fc) | Vertical (fc) | Uniformity Max:Min | CRI Min |
|---|---|---|---|---|
| Front display lot — customer facing ★ | 50 fc | 30 fc | 3:1 | 70+ (80 recommended) |
| Side / rear inventory lot | 20–30 fc | 10–15 fc | 4:1 | 70 |
| Service drive-through | 30 fc | 15 fc | 3:1 | 80+ |
| Customer parking | 5–10 fc | 2.5–5 fc | 4:1 | 50 |
| Entrance / exit | 10 fc minimum | 5 fc | 3:1 | 65 |
Source: IES RP-33 "Lighting for Exterior Environments" and IES DG-19 "Lighting for Automobile Dealerships". Values represent recommended maintained illuminance.
⚡ Why Vertical Illuminance Is the #1 Priority for Car Dealerships
Unlike parking lots where horizontal illuminance is primary, auto dealerships require high vertical illuminance because vehicles are displayed on vertical surfaces — the hood, doors, and front fascia all face customers at standing eye level. IES DG-19 recommends vertical illuminance ≥ 50% of horizontal illuminance measured at 3.5 ft height (car hood level). Mounting fixtures too high (above 35 ft) dramatically reduces vertical illuminance. This is why dealership poles are typically 25–30 ft — the optimal balance between coverage area and vertical illuminance delivery.
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 ★ Small Lots | 21,159 lm | 21,053 lm | 146–151 lm/W | 0.9958 | B3-U0-G3 | JAE200924-AG |
| OT 300W ★ Most Popular | 46,880 lm | 47,055 lm | 155–163 lm/W | 0.9969 | B4-U0-G5 | JAE200924-AJ |
| OT 420W Large Lots | 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. LED: Seoul Semiconductor STW8L8PA. CRI 70 standard; CRI 80 available on request for front display zones.
All models deliver 100% zonal lumens in 0–90° zone (full downward light) with U0 uplight across all wattages — physically zero uplight verified by independent LM-79 testing. The OT 300W at 47,055 lm @277V replaces a 1000W metal halide (approx. 40,000 lm initial, ~30,000 lm maintained) while consuming 73% less power.
Candela Distribution — OT 300W, Optic Comparison for Dealership Applications
Source: IES files AOK-300WOT-NVS-S5-00-5070-T302/T402/T502-P. All optics reach 0 cd at 90° (full cutoff). OT 300W @277V: 288W system power (LM-79 verified).
Dealership optic selection strategy: Type IV wide optic on front-row display poles for maximum coverage toward the street. Type V symmetric optic on central island poles for 360° vehicle illumination with no dark spots between rows. Type III forward-throw on road-edge poles to maximize street-facing brightness and attract passing traffic. All three optics reach 0 cd at 90° — full cutoff, no spill light toward neighboring properties.
Design Guide
Auto Dealership Lot Design Best Practices
🎨 CRI Is the #1 Decision Factor
CRI determines whether customers can accurately perceive paint colors at night. CRI 70 is the IES DG-19 minimum — at lower CRI, navy appears black, burgundy looks brown, and metallic finishes lose their sparkle. CRI 80+ is strongly recommended for front display zones where customers make purchasing decisions. OT Series is CRI 70 standard with CRI 80 available on request — specify at order time.
📐 High Vertical Illuminance — The Dealership Difference
Target vertical illuminance ≥ 50% of horizontal illuminance at 3.5 ft (car hood height). This means: keep pole height to 25–30 ft (not 35+ ft), use Type IV and Type V optics (not Type II), and maintain tight pole spacing in front display rows. A well-designed dealership lot should hit 25–30 fc vertical on the front display row.
⚡ Uniformity Prevents "Bright Spot + Dark Gap" Syndrome
Non-uniform lighting creates visual bands across the lot — some vehicles look great, others look dim. This actively harms sales because customers perceive poorly lit vehicles as lower quality. IES RP-33 specifies 3:1 max:min uniformity for display lots. Achieve this with proper pole spacing (max 2.5× mounting height) and consistent optic selection across all display poles.
🌡️ 5000K vs 4000K — Color Temperature Strategy
5000K is the dealership industry standard: it makes white vehicles appear crisp and bright, enhances the sparkle of metallic paints, and provides the highest visual acuity for color comparison. 4000K is preferred by some luxury brands (Mercedes-Benz, Lexus) for a warmer, premium ambiance. The OT Series DIP switch supports 3000K/4000K/5000K — set per zone or per dealer preference without re-ordering fixtures.
🏗️ Pole Height: 25–30 ft Is the Sweet Spot
Every foot of additional mounting height reduces vertical illuminance. At 25 ft, you achieve excellent vertical illuminance delivery. At 35 ft, vertical illuminance at car hood height drops by approximately 40% vs 25 ft. Use 25–30 ft poles for display zones, and 30–35 ft only for large open inventory lots where horizontal coverage is the priority and vertical illuminance is less critical.
🛣️ Front-Row Pole Density Drives Walk-In Traffic
The front display row — facing the street — is your primary marketing tool. Spec tighter spacing (50–60 ft between poles vs 70–80 ft in the rear) with Type IV optics angled toward the street. This creates the "bright wall of cars" effect that attracts passing customers. Typical 8-acre dealership: 40–50 poles total, with OT 300W Type IV/V at 25 ft mounting height.
Light Control
BUG Rating & Dark Sky Compliance
Dealerships need bright lots — but neighbors and municipalities still require light trespass control. The OT Series delivers full cutoff (U0 uplight across all wattages) with BUG ratings verified by independent LM-79 testing.
| Model | B (Backlight) | U (Uplight) | G (Glare) | Dark Sky E3 | Dark Sky E4 |
|---|---|---|---|---|---|
| OT 75W | B2 | U0 ✓ | G2 | ✓ Exceeds | ✓ Exceeds |
| OT 145W ★ | B3 | U0 ✓ | G3 | ✓ Meets | ✓ Exceeds |
| OT 300W ★★ | B4 | U0 ✓ | G5 | ⚠ B marginal | ✓ Meets |
| OT 420W | B5 | U0 ✓ | G5 | ✗ B exceeds | ⚠ G marginal |
BUG data from LM-79 reports. Dark Sky zone limits per IDA/IES Model Lighting Ordinance (MLO). E3=Suburban, E4=Urban. Most dealerships are E3/E4 zones.
Most auto dealerships are in E4 urban zones where OT 300W fully meets compliance. For E3 suburban locations adjacent to residential, add the OT Visor accessory to reduce backlight by 40–60%, or specify Type III optics on perimeter poles. U0 across all wattages means zero light going skyward — verified by independent LM-79 testing.
Compliance
Regulatory Compliance
DLC 5.1 Premium
Critical for dealership ROI. $100–200/fixture rebate from most US utilities. Reduces payback period to under 2 years.
✓ All OT models listed — maximum rebate tier
UL 1598
Listed for wet locations. Required for outdoor pole-mounted luminaires at all dealerships.
✓ UL Listed
Title 24 (CA) §140.7
LPD ≤0.14 W/ft². Photocell + dimming required. NEMA 7-pin twist-lock photocell receptacle standard.
✓ OT 300W at 163 lm/W = 55% under Title 24 LPD limit
IDA Dark Sky
Full cutoff design. BUG U0 = zero uplight across all wattages, verified by LM-79.
✓ U0 all wattages — fully dark sky compatible
IES RP-33 / DG-19
Automotive dealership lighting standard. Covers horizontal and vertical illuminance, uniformity, CRI.
✓ OT 300W exceeds all RP-33 display lot requirements
NEC 2023
Art. 410 luminaire installation, wiring, grounding for outdoor commercial applications.
✓ UL Listed compliance
💰 DLC Premium = Maximum Utility Rebates — The #1 ROI Factor for Dealerships
Auto dealers are ROI-focused buyers. DLC Premium listing unlocks the highest utility rebate tier — typically $100–200 per fixture depending on utility and state program. On a 40-pole dealership, that's $4,000–8,000 in direct rebate checks, dramatically reducing net investment cost. Always verify current rebate amounts at dsireusa.org or with your local utility before quoting.
ROI
Energy & Cost Comparison — 1000W Metal Halide vs OT 300W
| Metric | 1000W Metal Halide | OT 300W LED | Savings |
|---|---|---|---|
| System wattage (actual) | 1,080W (incl. ballast) | 288W (LM-79 @277V) | 73% reduction |
| Annual kWh/fixture (12 hr/day) | 4,730 kWh | 1,263 kWh | 3,467 kWh saved |
| Annual electricity @$0.15/kWh | $710/fixture | $189/fixture | $521/fixture |
| MH lamp replacement (every 2 yrs, $150/lamp) | $75/fixture/year | $0 | $75 saved |
| Total annual savings/fixture | — | — | $596/fixture/year |
OT power based on LM-79 tested 288W @277V (Report JAE200924-AJ). MH system wattage includes ballast loss (~8%). Electricity at US commercial average $0.15/kWh, 12 hrs/day operation.
📊 Typical 40-Pole Dealership — Full ROI Analysis
Annual Cost Savings
- ⚡ Electricity savings: $42,500/year
- 🔧 MH lamp replacement: $6,000/year
- Total annual savings: $48,500/year
One-Time Benefits
- 💰 DLC Premium rebate: $4,000–8,000
- 📈 Night traffic increase: +15–25% estimated
- 🏆 Better vehicle appearance → higher close rates
Total payback period: < 2 years — including DLC rebates
Recommendation
Recommended Configurations by Dealership Size
| Dealership Size | Model | Pole Count | Optic | CCT | Pole Height |
|---|---|---|---|---|---|
| Small (2–3 acres) | OT 145W | 15–20 poles | Type IV (front) + Type V (central) | 5000K | 25 ft |
| Medium (4–6 acres) ★ Most Common | OT 300W | 30–40 poles | Type III (road edge) + Type IV (front) + Type V (central) | 5000K | 25–30 ft |
| Large (8+ acres) | OT 300W / 420W | 50+ poles | Type III (perimeter) + Type IV/V (interior) | 5000K | 30 ft |
| Luxury brand (any size) | OT 300W CRI 80 | Per photometric | Type IV + Type V | 4000K | 25 ft |
Most Popular: OT 300W, 5000K, Type IV/V Mixed, 25 ft Poles
The OT 300W is the dealership volume leader — replacing 1000W metal halide across most medium-to-large lots. At 47,055 lm @277V with 163 lm/W efficacy (LM-79 report JAE200924-AJ), each fixture covers approximately 4,000–5,000 ft² of display area at 25 ft mounting height while easily exceeding IES RP-33's 50 fc horizontal and 30 fc vertical requirements.
Front display row spacing: 55–65 ft between poles at 25 ft height.
Central inventory spacing: 65–75 ft between poles with Type V optic.
For small lots (2–3 acres): OT 145W (21,053 lm @277V) at 50–60 ft spacing provides excellent display illumination at lower investment cost.
Frequently Asked Questions
Auto Dealership Lighting FAQ
Q: How bright does an auto dealership lot need to be?
Per IES RP-33 and DG-19, a front customer-facing display lot requires 50 fc horizontal illuminance and 30 fc vertical illuminance at a 3:1 maximum-to-minimum uniformity ratio. Side and rear inventory lots need 20–30 fc horizontal at 4:1 uniformity. Customer parking areas require 5–10 fc. Vertical illuminance is critical — vehicles are displayed on vertical surfaces, so IES recommends vertical illuminance ≥ 50% of horizontal at car hood and door height.
Q: What color temperature is best for displaying vehicles?
5000K is the most common choice for auto dealerships — it makes white vehicles appear crisp and bright, enhances metallic paint sparkle, and provides the highest visual acuity for customers comparing vehicles at night. Some luxury brands prefer 4000K for a warmer, premium ambiance. Avoid 3000K for display lots as it imparts a yellow cast that misrepresents paint colors. The OT Series supports 3000K, 4000K, and 5000K via DIP switch — one fixture, three options.
Q: How much can an auto dealership save by switching to LED?
A typical 40-pole dealership running 1000W metal halide (1080W system) pays approximately $58,000/year in electricity. Replacing with OT 300W (288W system) cuts annual electricity to $15,500 — saving $42,500/year. Add $6,000/year in avoided MH lamp replacement labor and materials, plus $4,000–8,000 in DLC Premium utility rebates. Total payback is typically under 2 years.
Q: How important is CRI for vehicle display?
CRI is critically important for vehicle sales. At CRI 70 or below, customers cannot distinguish subtle color differences between paint options — navy looks black, burgundy looks brown. IES DG-19 recommends CRI 70 minimum for vehicle display, with CRI 80+ preferred for front-row display. Poor CRI directly impacts night-time sales conversions. The OT Series is standard at CRI 70 with CRI 80 available on request.
Q: How should I design the pole layout for a car dealership lot?
Use 25–35 ft mounting height — higher poles reduce vertical illuminance on vehicle surfaces. Front display rows (customer-facing) use tighter 50–60 ft pole spacing with Type IV wide optics to maximize coverage toward the street and attract passing traffic. Central display areas use Type V symmetric optics for 360° uniform illumination. Edge poles nearest the road use Type III forward-throw optics. A typical 8-acre dealership requires 40–50 poles with OT 300W at 25 ft mounting height. Use free photometric layout from Auvolar LightSpec AI for site-specific design.
Ready to Design Your Auto Dealership Lighting?
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