How to Evaluate an LED Therapy Factory's Real Production Capacity (Not What They Tell You)

Every factory says they can produce 50,000 units per month. Very few actually can. We visited a factory that claimed 30,000 units/month capacity. They had one SMT line, two assembly tables, and four workers. Their real capacity was about 5,000 units/month on a good day.

Here’s how to figure out what a factory can actually produce, regardless of what their sales team tells you.

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## Why Factories Overstate Capacity

**Factories overstate capacity for three reasons:**

1. **They want your business.** Telling you they can produce 10,000 units/month when they can only do 3,000 means you might not place the order.

2. **They’re counting theoretical capacity, not practical capacity.** Theoretical capacity assumes 24/7 operation with zero downtime, zero defects, and zero changeover time. Practical capacity is typically 40-60% of theoretical.

3. **They’re counting total factory capacity, not available capacity.** A factory with 50,000 units/month total capacity that’s running at 80% utilization only has 10,000 units/month available for you.

## The Capacity Calculation Method

### Method 1: The SMT Line Calculation

**The SMT (Surface Mount Technology) line is the bottleneck in LED device production.** If the SMT line can’t produce enough PCBs, the rest of the factory can’t assemble enough products.

**The formula:**

> Practical SMT Capacity (boards/day) = Theoretical boards/hour × 16 hours × 60% utilization × 80% yield

**Example calculation for a typical LED mask PCB:**

– Board size: 100mm × 80mm
– Components per board: 165 (150 LEDs + 15 passives + MCU)
– SMT line speed: 45,000 CPH (components per hour) for a mid-range line
– Boards per hour: 45,000 / 165 = 273 boards/hour (theoretical)
– Practical boards per day: 273 × 16 hours × 0.60 × 0.80 = 2,091 boards/day
– Practical boards per month (25 working days): 52,275 boards/month

**But wait — does the factory have one SMT line or three?** Ask. Then verify during your visit.

**Red flag:** Factory claims 50,000 units/month but has one mid-range SMT line. The math doesn’t work.

### Method 2: The Assembly Line Calculation

**After SMT, the boards go to assembly (housing, battery, straps, packaging).**

**The formula:**

> Practical Assembly Capacity (units/day) = Workers × Units per worker per hour × 10 hours × 85% efficiency

**Example calculation:**

– Assembly workers assigned to your product: 8
– Units per worker per hour: 4 (including housing, battery, testing, packaging)
– Practical units per day: 8 × 4 × 10 × 0.85 = 272 units/day
– Practical units per month (25 working days): 6,800 units/month

**The assembly capacity (6,800) is lower than the SMT capacity (52,275).** Assembly is the actual bottleneck for LED therapy devices because it’s labor-intensive.

### Method 3: The Production Floor Observation

**This is the most reliable method because it’s based on direct observation, not factory claims.**

**During your factory visit, observe and record:**

**Key questions to ask during the visit:**

1. “How many SMT lines do you have? What brand and model?”
2. “How many workers are assigned to LED therapy device assembly?”
3. “What’s your current utilization rate across all product lines?”
4. “What other products are running on these lines?”
5. “How long does a typical changeover take between products?”
6. “What’s your record for monthly output of LED therapy devices?”

**Cross-reference their answers with your observations.** If they say 20 assembly workers but you count 8, there’s a discrepancy. If they say 3 SMT lines but you only see 1, they’re overstating.

## The Utilization Trap

**A factory running at 85% utilization sounds great — until you realize that means only 15% is available for you.**

**Typical utilization breakdown for an LED therapy factory:**

**Available capacity for a new client: 0%** unless the factory adds capacity or shifts allocation from an existing client.

**What to ask:**
– “What percentage of your current capacity is allocated to LED therapy devices?”
– “If I place an order for 5,000 units, what capacity would be available for me?”
– “How quickly can you scale up if my order volume increases?”

**Realistic answer:** “We can allocate 10-15% of our capacity to your products, which gives you about 3,000-5,000 units/month. If you need more, we’d need to add a shift or a line, which takes 8-12 weeks.”

**Unrealistic answer:** “We can do 50,000 units/month for you starting next week.”

## The Scalability Assessment

**Can the factory scale if your brand grows?**

**Ask the factory about their scalability plan:**
– “If I grow from 5,000 to 15,000 units/month over 12 months, can you support that?”
– “What would you need to invest to triple your LED therapy device capacity?”
– “Do you have space for additional SMT lines in your current facility?”

**Red flag:** Factory has no room for additional lines and no plan to expand. You’ll hit a ceiling on growth.

## The Verification Checklist

**Before committing to a factory, verify their capacity claim:**

**The 1.5x rule:** The factory’s practical capacity should be at least 1.5x your projected monthly demand. This provides a buffer for production spikes, quality issues, and other clients’ demand fluctuations.

## What We’ve Learned

1. **Calculate capacity yourself; don’t trust the factory’s number.** Do the SMT and assembly math during your visit. It takes 15 minutes and tells you more than their sales presentation.

2. **Assembly, not SMT, is usually the bottleneck.** LED therapy device assembly is labor-intensive. A factory with great SMT capacity but limited assembly workers will disappoint you on delivery.

3. **Available capacity matters more than total capacity.** A factory with 50,000 units/month total capacity but 0% available isn’t useful to you.

4. **Visit the factory.** You can’t verify capacity over email or video call. You need to count the lines, count the workers, and see the production floor with your own eyes.

5. **Build in a 1.5x buffer.** If your projected demand is 5,000 units/month, the factory should have at least 7,500 units/month of practical available capacity. Without this buffer, any spike in demand will blow your delivery timeline.

Evaluating an LED therapy factory’s real production capacity is about math, not trust. Do the calculation, verify during your visit, and build in a buffer. The factory that honestly says “we can do 5,000 units/month for you” is more reliable than the one that claims “50,000, no problem.” Your delivery timeline — and your brand reputation — depends on getting this right.

How to Evaluate an LED Therapy Factory’s Real Production Capacity (Not What They Tell You)

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