The Economics of Dual-Voltage (110V/220V) LED Therapy Devices
We were building an LED panel for both the US and European markets. The question: design one dual-voltage SKU or two regional SKUs? The dual-voltage power supply cost $3.80 more per unit. But it eliminated separate inventory pools, reduced MOQ constraints, and simplified our supply chain. Here’s the full economic analysis.
The Two Approaches
Approach 1: Regional SKUs
Separate products for 110V (US/Japan/Taiwan) and 220V (EU/UK/AU/China) markets.
| Component | 110V SKU | 220V SKU |
| Power supply | 100-120V input, $4.20 | 200-240V input, $4.20 |
| Power cable | US plug, $0.80 | EU/UK plug, $0.80 |
| Product label | 110V rated | 220V rated |
| Safety certification | UL (US) | CE/GS (EU) |
Approach 2: Dual-Voltage SKU
One product that accepts 100-240V input, sold globally.
| Component | Dual-Voltage SKU |
| Power supply | 100-240V input, $8.00 |
| Power cable | Region-specific plug, included per market |
| Product label | 100-240V rated |
| Safety certification | UL + CE (combined) |
The Cost Comparison
Per-Unit Cost
| Cost Item | Regional SKUs (avg) | Dual-Voltage | Difference |
| Power supply | $4.20 | $8.00 | +$3.80 |
| Power cable | $0.80 | $0.80 | $0.00 |
| Safety certification (amortized) | $0.60 | $0.90 | +$0.30 |
| Product label | $0.05 | $0.05 | $0.00 |
| SKU management overhead | $0.40 | $0.20 | -$0.20 |
| Total per-unit difference | +$3.90 |
Dual-voltage costs $3.90 more per unit. That’s a 5.5% increase on a $70 product cost.
Inventory Cost
Regional SKUs require separate inventory pools. If you sell in both the US and EU:
| Scenario | US Inventory | EU Inventory | Total Inventory | Dead Stock Risk |
| 50/50 demand split | 500 units | 500 units | 1,000 | Low |
| 70/30 demand split | 700 units | 300 units | 1,000 | Medium (EU may sell slower) |
| 80/20 demand split | 800 units | 200 units | 1,000 | High (EU MOQ may not be met) |
The problem with regional SKUs: If US demand is 80% and EU demand is 20%, you still need to meet the factory MOQ for the EU SKU (typically 500-1,000 units). You might end up manufacturing 1,000 EU units when you only need 200, leaving 800 units of dead stock.
Dead stock carrying cost: $2.50/unit/month for warehousing + opportunity cost of capital. 800 units of dead EU stock × 6 months × $2.50 = $12,000 in carrying costs.
Dual-voltage eliminates this problem. One inventory pool serves all markets. If US demand is 80%, you allocate 80% of inventory to US fulfillment and 20% to EU. No separate MOQs, no dead stock.
Certification Cost
| Certification | Regional SKUs | Dual-Voltage |
| UL listing (US) | $8,000 | $8,000 |
| CE/GS (EU) | $6,000 | $6,000 |
| EMI testing (FCC + EU) | $5,000 × 2 = $10,000 | $7,000 (combined test) |
| Safety testing (per voltage) | $4,000 × 2 = $8,000 | $5,000 (combined test) |
| Total | $32,000 | $26,000 |
Dual-voltage saves $6,000 in certification costs because you can combine EMI and safety testing into a single test campaign that covers both voltage ranges.
Amortized over 10,000 units: $0.60/unit for regional vs. $0.90/unit for dual-voltage… wait, that’s more per unit. But the total certification cost is lower ($26K vs $32K). At 10,000 units total, dual-voltage certification is $2.60/unit vs. $3.20/unit for regional — actually cheaper because you’re testing once, not twice.
Corrected per-unit certification cost (10K units):
- Regional SKUs: $32,000 ÷ 10,000 = $3.20/unit
- Dual-voltage: $26,000 ÷ 10,000 = $2.60/unit
Dual-voltage saves $0.60/unit on certification. That offsets $0.60 of the $3.90 power supply premium.
Logistics Cost
| Logistics Factor | Regional SKUs | Dual-Voltage |
| Minimum order quantity | 500 per SKU (1,000 total) | 500 total |
| Shipping wrong SKU to wrong region | Risk exists ($25/replacement) | Impossible |
| Inventory flexibility | Low (can’t reallocate between regions) | High (reallocate anytime) |
| Warehouse SKU count | 2 | 1 |
| Picking error rate | Higher (2 similar SKUs) | Lower (1 SKU) |
The wrong-SKU shipping problem: If you sell on Amazon in both the US and EU, there’s a 0.5-1% chance of shipping the wrong voltage SKU to the wrong region. Each error costs $25-40 in return shipping and replacement. At 10,000 units with 0.75% error rate = 75 errors × $32 = $2,400.
Dual-voltage eliminates this problem entirely. One SKU, one product, works everywhere.
The Full Economic Model
Assumptions: 10,000 units, 70% US / 30% EU demand, $199 retail price, $70 product cost
| Factor | Regional SKUs | Dual-Voltage | Savings (Dual-V) |
| Power supply premium | — | +$3.90/unit | -$39,000 |
| Certification | $3.20/unit | $2.60/unit | +$6,000 |
| Dead stock (EU overproduction) | $12,000 | $0 | +$12,000 |
| Wrong-SKU shipping errors | $2,400 | $0 | +$2,400 |
| Inventory flexibility value | — | $5,000 (estimated) | +$5,000 |
| Net cost difference | -$13,600 |
Dual-voltage costs $13,600 more than regional SKUs over 10,000 units — or $1.36 per unit. That’s a 0.7% increase on a $199 retail product.
When Dual-Voltage Makes Sense
Go dual-voltage when:
| Condition | Reason |
| Selling in 3+ countries | Inventory complexity of regional SKUs compounds |
| Product is portable (mask, cap) | Users travel between voltage regions |
| Demand split is uncertain | Dual-voltage eliminates allocation risk |
| Manufacturing volume is low (<5,000 units) | Regional MOQs are hard to meet |
| You want one Amazon listing globally | Simplifies marketplace management |
Stick with regional SKUs when:
| Condition | Reason |
| Selling in one region only | No need for dual-voltage |
| Very high volume (>50,000 units) | Power supply savings dominate |
| Product is stationary (large panel) | Users don’t travel with it |
| Regional certification is a blocker | Some markets require specific voltage-rated products |
What We’ve Learned
1. Dual-voltage costs $1.36 more per unit — 0.7% of retail price. That’s a rounding error for most brands, and it buys significant supply chain simplicity.
2. The real savings are in inventory flexibility and error elimination. $19,400 in dead stock, shipping errors, and inventory management costs are the hidden costs of regional SKUs.
3. Portable products should always be dual-voltage. LED masks and caps travel with customers. A US customer who takes their $199 mask to Europe and plugs it into 220V with a 110V-only power supply will destroy the product — and leave a 1-star review.
4. Large panels can be regional. A 36″ LED panel isn’t traveling in anyone’s suitcase. The customer uses it in one location, in one voltage region. Regional SKUs make sense here.
5. Dual-voltage power supplies are getting cheaper. The $3.80 premium over single-voltage supplies has been decreasing as global demand for universal power supplies increases. By 2027, expect the premium to be $2.00-2.50.
The economics of dual-voltage LED therapy devices favor dual-voltage for most products and most brands. The $1.36 per unit premium is negligible compared to the inventory flexibility, error elimination, and customer experience benefits. Design dual-voltage for masks and caps (portable products), and consider regional SKUs only for large stationary panels where the cost savings are meaningful at scale.