UV Cost

UV Curing Cost Per Part: Estimating and Quoting the Real Number

What actually drives UV curing cost per part, from lamp energy and consumables to scrap and overhead, plus how to build a quote that holds up.

UV curing cost per part is dominated by four buckets: energy, lamp consumables, labor and machine time, and the scrap that undercure creates. For a mercury arc line, energy is the loud one. A 300 watt per inch lamp on a 10 inch web draws 3,000 watts of lamp power, and total system draw including power supply, blowers, and exhaust often runs 1.5 to 2 times that, so budget 4.5 to 6 kW. At 0.12 dollars per kWh, 6 kW costs 0.72 dollars per hour of run. Mercury UV Lamp Energy Cost and UV LED Energy Cost turn draw and duty cycle into a per-hour and per-part figure.

Convert energy per hour to energy per part with throughput, not wishful line speed. If the line genuinely produces 1,800 parts per hour at 85 percent uptime, effective output is about 1,530 parts. At 0.72 dollars per hour that is roughly 0.00047 dollars of energy per part, essentially noise on a small part but real on a slow, wide-web coating job running 200 parts per hour, where the same energy lands near 0.0036 dollars each. The lesson: energy per part is energy per hour divided by actual good parts per hour, and the uptime factor is where naive quotes lose money. UV Cure System Throughput ties process window to realistic output.

Lamp consumables usually dwarf energy on mercury systems. A mercury bulb costs 150 to 600 dollars and lasts 1,000 to 3,000 hours before output decays past useful dose. At 400 dollars over 2,000 hours, that is 0.20 dollars per run hour, several times the energy cost. UV Lamp Replacement Cost and UV Lamp Life Remaining set the amortized figure, and the key error is amortizing over rated hours instead of usable hours: if a bulb is pulled at 1,500 hours because decay ate your dose margin, the real per-hour cost is 0.27 dollars, not 0.20. Quote against usable life, not the box number.

LED changes the cost shape. A UV LED array draws less power for the same effective dose, often 30 to 60 percent less at the wall, and rated life runs 20,000 hours or more with little decay, so consumable cost per hour approaches zero. But the capital is high, often 15,000 to 60,000 dollars per station. UV LED Retrofit Payback and Thermal Oven vs UV Cure Payback weigh that capital against saved energy, saved bulbs, and eliminated warm-up idle. A high-hours line running 4,000 hours a year that saves 0.20 dollars per hour on bulbs plus 0.30 dollars on energy recovers meaningful money, while a 500 hour per year line waits years. Utilization decides the answer.

Labor and machine burden are the quiet majority of cost. If a UV station carries a loaded machine rate of 45 dollars per hour, including operator, floor space, and depreciation, and the line makes 1,530 good parts per hour, that is 0.029 dollars per part of burden, sixty times the energy. This is why chasing energy pennies while ignoring cycle time is the classic estimating mistake. The real cost lever is parts per hour: raising effective throughput 10 percent cuts burden per part by about 9 percent, far more than any lamp swap. Quote the machine rate honestly and let throughput do the work.

Scrap from undercure is the cost that ruins otherwise tidy quotes. A tacky, poorly adhered, or yellowed part is often a total loss plus the labor already in it. If your undercure scrap runs 2 percent and each part carries 0.50 dollars of material and prior labor, that is 0.01 dollars of scrap cost spread across good parts, plus any rework. Running thin on dose margin to gain line speed trades a tiny throughput gain for a scrap spike. UV Cure Defect Rate and UV Rework Cost quantify this, and a defensible quote carries a scrap allowance sized to your actual first-pass yield, not zero.

Overhead and inert-atmosphere extras belong in the quote when they apply. Oxygen inhibition on thin coatings can force a nitrogen blanket, and UV Nitrogen Consumption shows that inerting a cure zone can burn 50 to 300 standard cubic feet per hour of nitrogen. At 0.02 dollars per standard cubic foot, 150 scfh is 3 dollars per hour, which on a 200 part per hour job is 0.015 dollars per part, larger than energy and lamp combined. Cooling, exhaust, and radiometer calibration labor are smaller but real. Roll these into overhead rather than pretending the process is just a lamp and a belt.

A quote holds up when every line item traces to a number. Build it as material plus loaded labor and machine time per part, plus amortized lamp cost over usable hours, plus energy per good part, plus a scrap allowance from your measured defect rate, plus applicable overhead like nitrogen and exhaust, then add margin. The two failure modes are optimistic uptime and rated-life lamp amortization; both understate cost by hiding real hours. Sanity check the total against UV Coating Cure Cost Per Part for the relevant product, and requote when belt speed, dose margin, or utilization shift, because each moves cost per part directly.

Published 2026-07-01.