I review the specs on over 200 unique lighting products every year before they reach my company's customers. And if you're using a standard, non-dimmable, general-purpose AC/DC power supply for a modern high bay LED fixture, you're probably making a mistake. It's not that they won't work—they'll light up. But you're leaving performance, efficiency, and longevity on the table. What was standard practice for HID high bays five years ago doesn't fly in 2025.

The Old Playbook Doesn't Fit

The old thinking was simple: high bay needs big power, low bay needs small power. You'd grab a cheap, fixed-output driver and call it a day. But that ignores what's actually happened in the last few years. Modern high bay fixtures, especially ones designed for spotlight image distribution or even some of those funky chandelier adaptations people are installing in warehouse-retail spaces, have much more sophisticated needs.

In my opinion, the biggest shift is in dimming and control. A high bay fixture in a distribution center that runs 24/7 with no dimming? That's fine for a basic driver. But most commercial spaces are now retrofitting with motion sensors and daylight harvesting. A cheap driver might not be compatible with that 3-in-1 dimming signal (resistor/PWM/voltage). I can't tell you how many times I've seen a spec that says 'dimmable' and then lists a driver that only supports 0-10V, ignoring the PWM control that the building management system actually uses.

A My First-Year Mistake

Honestly, I made this exact error. In my first year doing quality reviews, I approved a batch of 200 high bay fixtures for a warehouse project. The client spec said 'dimmable,' and the purchasing team sourced a driver that was, technically, dimmable—but only via a rheostat. The building had a fully digital control network. The result? We had to rip out all 200 drivers and replace them with mean-well LPC-60-700 class drivers that actually accepted the building's 0-10V signal. That misstep cost us over $18,000 in labor and re-shipping. Learned that lesson the hard way.

Three Reasons the 2020 Approach is Wrong in 2025

  1. Thermal Management is Different: A sealed high bay housing runs way hotter than an open-frame power supply bench test suggests. A standard 'enclosed' switching power supply with a 70°C rating might fail within a year in a non-ventilated high bay fixture. You need a driver rated for high case temperatures and with a fan-less design, like the mean-well HDR series for DIN rail setups or a potted-type driver for the fixture itself.
  2. Power Factor Isn't Optional: I get why some facilities ignore power factor on small loads. But a warehouse running 200 high bays? A low power factor (say, below 0.9) can actually trigger penalty charges from the utility company. The 'standard' power supply often has a passive PFC that barely hits 0.85 under load. A modern driver with active PFC, like the mean well 12v 5a power supply for control boards or a high-power LED driver for the main array, will keep you above 0.95. That's a real cost difference.
  3. Dimming Range and Compatibility: The '3-in-1 dimming' thing? I used to think it was marketing fluff. To be fair, some implementations are. But having a driver that can actually handle resistor, PWM, AND 0-10V dimming in one unit—like a mean-well dimmable led driver—saves you from having three different SKUs on your shelf. That's especially true for those 'high bay vs low bay lighting' projects where the lighting design might change halfway through the build-out.

The 'It Works on the Bench' Myth

There's a common misconception that if a power supply powers an LED array on a test bench, it's fine for the fixture. This was true fifteen years ago when “LED driver” meant a simple constant voltage source. Today, with tight constant current regulation (like the mean well lpc-60-700 datasheet dimming specs show), the driver is responsible for the lifespan of the LEDs. If the current ripple is too high, or the voltage regulation drifts with heat, you'll see premature lumen depreciation. The LEDs look fine on day one, but by month 18, they're half as bright.

Per Mean Well's technical documentation, a driver designed for dimming should maintain a dimming range of 10-100% (or wider) with less than 5% flicker. A standard power supply can't do that.

Responding to the Obvious Pushback

I know what some of you are thinking: 'But a basic power supply is half the cost!' And you're right—if you're looking at upfront unit cost only. But our Q1 2025 audit showed that projects using dedicated dimmable drivers had a 34% lower service call rate in the first year. The rework costs alone wiped out any savings. The cheapest option is almost never the lowest total cost when you include the risk of a failed install.

And about those funky chandelier applications in commercial retail? The basic driver's inability to handle the control system is a huge headache. I've seen a $5,000 custom chandelier get installed with a $20 power supply, only to have the whole thing flicker because the driver couldn't sync with the low-voltage control. A mean well 12v 5a power supply might be overkill for powering a control board, but that $35 investment saves a $5,000 re-install.

Bottom Line

The technology has shifted. The days of a single 'high bay vs low bay' brochure covering all your power needs are gone. Your customers—whether they're an industrial plant or a boutique retail store—are expecting their lighting to be smart, efficient, and responsive. Using a generic power supply because it 'lights up' the LEDs is choosing the easy path now for a bigger headache later. Match the driver to the control system and the thermal environment. That's not just my opinion; it's what the warranty data shows us year after year.