When I took over purchasing for our company in 2020, I thought my main job was saving money. So when we planned an LED retrofit in 2022, I found power supplies that were about 40% cheaper than the Eaton units our electrical contractor recommended. I ordered 30 of them. Six failed within a year.
The Problem I Thought I Was Solving
The LED tube retrofit was a good idea. Our old fluorescent fixtures were humming, flickering, and drawing far more power than they should. Our facility manager calculated we'd cut lighting energy costs by nearly half.
The problem wasn't the tubes. It was the power supplies I chose. Same wattage. Same voltage. Same connectors. About 40% less money. On paper, they were identical. They weren't. Put another way: they met the specs on paper and nothing more.
In my defense, I process 60–80 orders a year across multiple vendors. Power supplies were one line item among many. I didn't have time to become a power electronics engineer. I just checked that the numbers matched the Eaton spec sheet.
I wish I had tracked the failure rate more carefully from the start. What I can say anecdotally: 6 out of 30 units failed within the first year, and two more died in the second year. Our old fluorescent fixtures ran for 12 years without a single ballast failure.
The Deeper Problem: Why They Kept Failing
After the third failure, I stopped ordering replacements and started researching. Here's what I found.
Surge Protection Was Missing
Our building has dirty power. The HVAC compressors kick in, the elevators cycle, the copier draws a ton of current. Voltage spikes are normal in a commercial building.
Eaton designs power supplies for that reality. Surge suppression circuits are standard in their line. The budget units we bought didn't. What I mean is, they had no surge protection anywhere in the circuit.
A power supply without surge protection in a commercial building is like a phone without a case. One spike, and it's done.
Heat Was the Silent Killer
Power supplies generate heat. That's physics. But the units we bought had minimal heat sinks and ran hot — seriously hot. Our janitor mentioned the hallway unit was uncomfortable to touch.
Heat degrades electrolytic capacitors. It's not a question of if they'll fail; it's a question of when. The Eaton PSG480F24RM power supply — the 480-watt, 24-volt unit we eventually standardized on — has proper thermal management and is rated for continuous duty. It runs noticeably cooler.
The Certification Gap
This was the real eye-opener. The units we bought claimed CE approval. But when I checked the manufacturer's declaration, the certificate referenced a different model. Not the one we purchased.
The Eaton PSG480F24RM power supply is UL Listed. That means an independent testing lab verified safety and performance, and Eaton has to maintain that listing through follow-up audits.
"UL Listing means the product was actually tested by a third party — not just stamped with a mark. I verify the file number before I order anything now."
I don't have hard data on industry-wide failure rates for non-certified power supplies. But based on our experience, my sense is that the specific units we bought met their specs on day one — then degraded fast once they were running real loads in a real building.
The Real Cost of "Saving" $50 Per Unit
Let me actually add up what six failures cost us:
- Replacement hardware: $76 (two units were out of warranty)
- Service calls: $180 per visit × 6 = $1,080
- Rush shipping: $201 for two overnight replacements
- Electrician labor: about $900 across all the callbacks
Total: $2,257. On a purchase that saved us about $1,500 upfront. Not a good trade.
And the numbers don't include the softer costs. The conference room where the lights died during a client presentation. The hallway that was dark for a week. The hours I spent on hold with the supplier's warranty department. Oh, and the supplier stopped responding to emails by the end.
The worst part: when the lights went out during that client meeting, it wasn't the power supply that looked bad. It was me. I signed the purchase order.
The Day I Changed My Mind About Paying More
In March 2024, we needed an Eaton 1800-watt inverter for a backup power setup in our server room. Planned maintenance was coming up and the old UPS was dead. Had two days to source a replacement. Normally I'd get multiple quotes and wait for the best price, but there was no time. I went with the distributor that could deliver overnight.
The unit cost $400 more through that distributor. I hesitated for about five minutes, then approved it. The alternative was missing a $15,000 client deadline because our systems would be down during maintenance.
That's when it clicked. The rush fee bought certainty, not just speed. And certainty is cheap compared to explaining to a client why their project is late because you tried to save $400 on an inverter.
What We Do Now
We standardized on Eaton for anything that runs continuously:
- Power supplies for LED lighting: Eaton PSG480F24RM power supply units. We have a dozen running for 18 months with zero failures.
- Backup power: Eaton 1800-watt inverter for the server room and security system.
- LED tubes: Eaton LED tubes matched to the power supply specs. We tried mixing brands once and got flickering. Never again.
- Exterior lighting: when we added spotlights to the building exterior — the "spotlight house" look, where the whole facade glows at night — we used an Eaton lighting contactor. Same logic: don't pair expensive fixtures with a flimsy switch.
One thing that came up during the exterior lighting project: a colleague asked if we could just run the new LED spotlights 24/7. That reminded me of a question I've seen people ask online — "can tomatoes grow in 24 hours of light?" The answer to both is no. Plants need dark periods to process what they absorb; and designing a lighting system for 24/7 operation means paying for capacity you rarely use. Right-sizing beats over-sizing, every time.
(Should mention: we're a mid-size commercial office with fairly stable power. If you're dealing with a manufacturing plant, a hospital, or somewhere with extreme power conditions, the calculus might be different. I can only speak to what worked for us.)
My Buying Checklist Now
- Is it UL Listed? Does the file number match the specific model?
- Does the datasheet specify surge protection and thermal ratings?
- What's the warranty — and can the vendor actually support it?
Bottom Line
The $1,500 I saved on budget power supplies cost us $2,257 in failures, plus a fair amount of embarrassment. Since switching to Eaton, we've had zero failures in 18 months. That's not a guarantee — it's just our experience.
Sometimes the expensive option is actually the cheaper one. Especially when the lights going out isn't an inconvenience. It's a disaster.