The honest answer is that it depends on the technology. A low-power UV LED module can run a full shift on the energy a household bulb uses in an hour, while a broadband mercury-arc curing lamp can draw several kilowatts continuously. The variables that decide the figure are lamp type, rated wattage, duty cycle, and cooling load.
What Drives UV Lamp Power Consumption
Lamp technology. Mercury-arc lamps convert electrical power to UV at a modest efficiency and reject the rest as heat and non-useful wavelengths, so a 6-inch arc lamp is often specified at 200 to 240 watts per linear inch, reaching a few kilowatts for a wide head. UV LED arrays convert a much larger share of their input into the target wavelength and run cooler, so an LED flood head covering a similar area typically draws a few hundred watts.
Rated wattage. Within a technology, higher output means higher draw. A lamp built for 8,000 mW/cm² pulls more than one built for 2,000 mW/cm² at the same area.
Duty cycle. Arc lamps are usually kept lit continuously with a mechanical shutter controlling exposure, because frequent restarts shorten bulb life and require warm-up. That means they consume power even between parts. LED heads switch on and off instantly with no penalty, so on an intermittent line they only draw power during the actual cure.
Cooling. Arc systems need exhaust blowers and sometimes chillers; those auxiliary loads add to the total. LED heads need fans or a water loop, a smaller addition.
Comparing the Two Families
For a line running continuously at high throughput, a broadband arc system and an LED system sized to the same dose can end up closer in total energy than the headline wattages suggest, because the arc lamp does more of the curing work per unit area. For a line that cures in bursts with idle time between, LED wins decisively because it is off when not curing. The Incure L-Series UV LED flood lamps are built for that instant-on pattern, while the Incure F-Series flood lamps serve continuous high-spectrum work.
Estimating Your Own Consumption
- Note the lamp’s rated input power in watts.
- Add auxiliary loads: exhaust blower, chiller, controller.
- Multiply by hours of actual operation per day. For an always-lit arc lamp, that is the full shift; for an LED head, it is cure seconds times parts per day.
- Divide by 1,000 for kilowatt-hours, then apply your energy rate.
A 300-watt LED head curing for three seconds on 2,000 parts a day uses about 0.5 kWh. A 3-kilowatt arc lamp lit for an 8-hour shift uses 24 kWh plus cooling. The gap is large when the line is not running flat out.
If you want help modeling the energy cost of a specific curing step before you buy, Email Us with your part rate and cure requirement.
Reducing UV Lamp Energy Use
- Match the source to the duty cycle. Choose LED for intermittent or indexed lines so the lamp is off between parts.
- Size to the dose, not the maximum. A lamp running well above the required irradiance wastes energy; set exposure to deliver the specified dose with a reasonable margin.
- Use a conveyor for volume. The Incure CDM UV conveyor keeps a single head working efficiently rather than cycling multiple stations.
- Keep optics clean. A fogged emitter window or a degraded light guide forces longer exposure for the same cure, raising consumption.
- Maintain the source. An aged bulb or LED module loses output; operators compensate with longer cycles until the part fails. Replace on schedule.
- Shutter or sleep idle lamps. If an arc lamp must stay lit, close the shutter; if a line stops for an extended break, plan the restart around warm-up rather than leaving everything running.
The Broader Picture
UV curing usually comes out ahead of thermal curing on energy regardless of lamp type, because there is no oven mass to heat and hold and no long dwell time. Replacing a gas or electric drying oven with a correctly sized UV line often cuts the curing step’s energy by a wide margin while also freeing floor space and removing solvent handling. Our guide to choosing a UV lamp for resin curing covers the sizing decisions that keep that advantage intact.
Bottom Line
Some UV lamps, particularly high-power arc models kept lit all shift, do use a lot of electricity. Others, particularly LED heads on intermittent lines, use very little. The controllable factors are technology choice, correct sizing, clean optics, and matching the source to how often it actually cures. Contact Our Team for help selecting an energy-appropriate UV curing solution.
Visit www.incurelab.com for more information.