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To work out the payback on an LED upgrade, add up what your halogen rig costs each year in electricity and replacement lamps, subtract what the LED rig will cost to run, and divide the net price of the LED fixtures by that yearly saving. Swapping 12 × 1000 W PAR64 cans for 12 × 145 W LED PARs saves about 10.3 kWh for every hour the rig is on. Whether that pays back in months or in years depends mostly on how many hours a year the rig runs.
What goes into the calculation
You need six inputs. Use your own numbers wherever you have them.
- Power per fixture, old and new. For halogen, use the lamp wattage. For LED, the wattage on the label is the maximum, and real draw at your usual looks is often lower. A plug-in power meter gives you the real figure.
- Hours of use per year, including rehearsals and setup, not only show time.
- Electricity rate per kWh from your bill or the venue's.
- Lamp price and rated life for the halogen lamps, from the lamp datasheet or your supplier.
- Net upgrade cost: the LED fixtures, plus any new cables or controller, minus what you can get for the old cans and dimmers.
- Extras you can put a number on, such as a power distribution upgrade you would no longer need.
Then four formulas:
- Annual energy saving = (old watts − new watts) × hours per year ÷ 1,000 × rate
- Annual lamp saving = number of fixtures × hours per year ÷ lamp life × lamp price
- Payback in years = net upgrade cost ÷ (energy saving + lamp saving)
- Simple ROI over N years = (annual savings × N − net cost) ÷ net cost
Worked example: 12 PAR64 cans vs 12 LED PARs
The figures below are example inputs to show the method. Replace them with your own.
| Input | Example value |
|---|---|
| Halogen rig | 12 × PAR64 at 1,000 W = 12,000 W |
| LED rig | 12 × 145 W LED PAR (rated wattage, for example ZQ01061 145W PAR light) = 1,740 W |
| Power saved per hour of use | 10.26 kWh |
| Lamp price and life | Example: $25 per lamp, 300 rated hours |
| Net LED cost | Example: $1,800 for the set (a round planning figure, not a quote) |
| Electricity rates | 0.15 and 0.30 per kWh (the math is the same in dollars, pounds or euros) |
Results for four usage levels:
| Use per year | kWh saved | Energy saving at 0.15 / 0.30 | Lamp saving | Payback at 0.15 / 0.30 |
|---|---|---|---|---|
| 50 h (occasional events) | 513 | $77 / $154 | $50 | about 14 years / about 9 years |
| 208 h (weekly service and rehearsal, 4 h a week) | 2,134 | $320 / $640 | $208 | about 3.4 years / about 2.1 years |
| 400 h (busy mobile or rental rig) | 4,104 | $616 / $1,231 | $400 | about 1.8 years / about 1.1 years |
| 1,040 h (bar stage, 4 nights × 5 h a week) | 10,670 | $1,601 / $3,201 | $1,040 | about 8 months / about 5 months |
Two adjustments make this more realistic for your rig:
- Dimmer levels. The table assumes the halogen cans run at full. If your rig mostly sits at half intensity, it draws less, so scale the energy saving down. A power meter on one dimmer channel during a typical show gives you a fair average.
- Brightness parity. A saturated gel on a PAR64 blocks most of the lamp's output, so for colored washes an LED PAR in this class often replaces a gelled can one for one. For bright white front light, a 145 W LED PAR has less output than a 1000 W PAR64, so you may need more units or a COB fixture. Measure or estimate light levels at your throw distance, then rerun the numbers with the real fixture count.
Savings the simple formula leaves out
Power distribution and circuits
This is often the biggest practical change. Twelve 1000 W cans draw about 100 A at 120 V, or about 52 A at 230 V. Under the usual 80% rule for continuous loads, a 120 V, 20 A circuit carries 16 A, which is one 1000 W PAR64 per circuit (two would draw 16.7 A). In 230 V countries a 16 A circuit carries about 12.8 A continuous, which is two cans.
Twelve LED PARs at 145 W draw about 14.5 A at 120 V or 7.6 A at 230 V. That fits on a single 20 A circuit in the US, or a single 10 A, 13 A or 16 A circuit in the UK, EU or Australia, without the dimmer packs. Fewer circuits means less cable to carry, less setup time, and gigs at venues that could never power the halogen rig. Follow your local code, use RCD protection on 230 V systems and GFCI where US code calls for it, and ask a licensed electrician about fixed wiring.
Heat
Nearly all the power a halogen rig draws ends up as heat on stage and in the room. LED fixtures still produce heat and need ventilation, but cutting the rig's load from 12 kW to under 2 kW means performers stay cooler and air conditioning works less. That saving is real, but it depends too much on the building to put a number on here.
Dimmer packs
LED fixtures must not be fed from a dimmer channel. Set the channel to non-dim or switch mode if the pack has one, or move the LEDs to a constant-power circuit and dim them over DMX. Once the halogen rig is retired, old dimmer packs can be sold, which lowers your net upgrade cost.
LED running costs are not zero
LED fixtures do not need lamp changes, but they are not maintenance-free. Fans collect dust, drivers and power supplies can fail, and LED output fades slowly over many thousands of hours, faster if the fixture runs hot. Keep a small yearly allowance for repairs and cleaning in your calculation. It barely changes the result for a busy rig, but it keeps the numbers honest.
Run your own numbers in five steps
- Count your halogen fixtures and lamp wattages, and estimate yearly hours from your calendar.
- Read the electricity rate off the bill, using the rate per kWh, not the monthly total.
- Price replacement lamps and check their rated life.
- Decide how many LED fixtures you need for the same coverage, and get real prices.
- Put everything into the four formulas, then repeat with a rate 20% higher to see how sensitive the payback is to future price rises.
When energy savings alone do not justify it
A rig used for 50 hours a year takes about 9–14 years to pay back on energy and lamps in the example above. For a school hall or a church that only lights up a few times a year, the decision rests on other things: colors without gels, much lower heat, fewer circuits, no lamp failures mid-show, and DMX control of every fixture. Those are good reasons to switch, but call them what they are when you present the budget, instead of claiming a fast payback.
FAQ
How much energy does an LED PAR save compared to a PAR64?
Comparing rated wattages, a 145 W LED PAR uses about 85% less power than a 1000 W PAR64, a saving of 0.855 kWh for every hour it runs. Real savings depend on the levels you run both fixtures at.
Is an LED PAR as bright as a 1000 W PAR64?
For saturated colors, a mid-size LED PAR often matches a gelled PAR64 because the gel blocks so much light. For open white, most budget LED PARs put out less than a 1000 W PAR64, so plan extra fixtures or a COB light for bright white front light.
Can I plug LED PARs into my old dimmer packs?
Not into a dimming channel. Set the channel to non-dim or switch mode if available, or use constant power, and control intensity over DMX.
How long do LED stage lights last?
LED sources last far longer than halogen stage lamps, which are rated in hundreds of hours. Their output drops gradually rather than failing outright, and fans and power supplies are usually the first parts to need attention. Keeping fixtures clean and well ventilated extends their life more than anything else.
