If you've ever had an LED fixture flicker three weeks after install, you know the feeling: it's rarely the LED chip. It's the power supply.

I'm a quality/compliance manager at a lighting-grade power supply distributor. I review every Mean Well order before it ships—roughly 200 unique specifications a year. Maybe 180, I'd have to check the system. In our Q1 2024 quality audit, I rejected 6% of first deliveries because the voltage/current rating didn't match the fixture. A lesson learned the hard way.

The comparison framework: 24V vs 48V, not brand vs brand

People assume a reliable brand means any model works. Brand reliability is table stakes. The Mean Well catalog—LRS, HDR, LPC, HLG—covers both constant voltage and constant current. The first question is what your lighting circuit needs.

Type mean-well 48v power supply into a search engine and you'll get hundreds of listings. The brand name is only the beginning. If you're comparing a mean well 24v 10a power supply with a mean well 48v power supply, you're comparing two power-distribution architectures. For the same power, 48V uses half the current of 24V. That one difference drives wire size, voltage drop, fixture compatibility, and total installed cost.

I'll compare them on three dimensions: wiring, fixture compatibility, and true cost. I'll also answer a question any grow-light specifier asks: what does a grow light do, and why does its power supply matter?

Dimension 1: Wiring and voltage drop

P equals V times I. A 240W load at 24V draws 10A; at 48V it draws 5A. Less current means less voltage drop over distance. For a long run in a warehouse or grow room, 48V can sometimes use 16 AWG wire where 24V needs 12 AWG. That's a ton of copper saved, plus labor.

The surprise wasn't that 48V wins on paper. It was how often 24V is still the right answer. Most LED strip, panel, tape, and custom architectural fixtures are designed around 24V. If the fixture says 24V, feeding it 48V is a reliability risk.

The contractor needed help with a spotlight Cleveland job: 120 spotlights, 24V distribution, and a plan to switch to 48V to reduce cable size. I asked for the spotlight datasheet. Every fixture driver was 24V only. Switching supplies would have meant replacing 120 drivers. Total rework: around $3,200. We kept 24V, added one homerun, and the problem disappeared. The better voltage would have been a costly mistake.

Conclusion: 48V wins for long feeder runs and high-power distribution. 24V wins for fixture simplicity and installations already designed around it.

Dimension 2: Fixture compatibility, dimming, and what does a grow light do?

Compatibility beats raw power. A Mean Well LRS-150-24 is a constant-voltage supply: 24V, 6.5A, 156W. A Mean Well LPC-60-700 is a constant-current driver: 700mA, with a voltage range matched to the LED string. If you wire a constant-voltage supply to a current-controlled LED array, you'll either underdrive or overdrive it.

What does a grow light do? It replaces sunlight with a specific spectrum for photosynthesis. But electrically, a grow light is an LED array. Some grow-light arrays are designed for constant current; others use constant-voltage modules. High-power grow light bars often use Mean Well 48V power supplies because they distribute power over long racks with less loss. Small grow strips are usually fine at 24V. The driver must match the fixture—not the other way around.

Organic chandelier example: I once helped spec drivers for an organic chandelier—LED filaments woven through reclaimed wood and hand-blown glass. Each filament string was rated 700mA with a forward voltage around 24V. A 24V 10A power supply alone would not work, because the string needs current limiting, not just voltage. We used a Mean Well LPC-60-700 constant-current driver. It cost slightly more than a standard constant-voltage supply, but it prevented a $2,200 redo. (Should mention: we also tested it with the actual fixture before ordering.)

People think more watts means more light. Actually, a power supply that is bigger in voltage can destroy a fixture. If the spec says 48V constant voltage, use a Mean Well 48V power supply. If it says 24V, use 24V. If it says 700mA, use a constant-current driver.

Conclusion: check the LED driver type first. Then choose voltage.

Dimension 3: Total cost and transparency—what's not in the quote

I've learned to ask what's NOT included before asking what's the price. The vendor who lists all fees upfront—even if the total looks higher—usually costs less in the end.

What I mean is that the cheapest quote isn't just about the sticker price. It's about the total cost including wire, labor, and the risk of a redo. For a recent 500-unit order worth $18,000, we quoted a fixture line two ways. Option A was a Mean Well 24V 10A power supply, roughly $21 each. Option B was a Mean Well 48V power supply, $22.20 each. On a 500-unit run, that's $600 more upfront. But Option B allowed 18 AWG wire instead of 12 AWG on a 40-meter run, cutting material and labor by $4.70 per fixture. Total installed cost: about $2,350 less.

The surprise wasn't the price difference. It was how much the installation method changed. By contrast, a job with short runs and existing 24V fixture drivers will cost more if you switch to 48V—because you'd be replacing drivers, not wire.

Transparent data, as of April 2025: Mean Well's published LRS-350-24 datasheet lists 24V/14.6A/350W, and the LRS-150-48 lists 48V/3.2A/150W. Verify current specifications at meanwell.com before ordering. If a supplier can't provide a datasheet and a clear product number, that's a red flag. Datasheets, certifications, and dimming curves are part of the product.

Conclusion: calculate total installed cost. Transparent pricing is a spec, not a sales tactic.

So which should you choose? A practical recommendation

Here's what you need to know:

  • Choose a 24V Mean Well supply (e.g., LRS-150-24 or LRS-350-24) if: LED strip, tape, panels, under-cabinet lighting, fixtures marked 24V, runs under 5 meters, or easy dimming compatibility.
  • Choose a 48V Mean Well supply (e.g., LRS-150-48) if: long runs, higher-power LED modules, grow light bars, or the fixture spec explicitly says 48V.
  • Choose a constant-current Mean Well driver (e.g., LPC-60-700 or HLG series) if: you're driving a series LED string, a custom organic chandelier, or a grow light with a specified current rather than voltage.

One final note. What does a grow light do? It emits light wavelengths plants actually use, but it only does its job if the driver supplies stable power. A Mean Well 48V power supply is common in commercial grow rooms because it minimizes distribution loss. A small 24V kit works for a cabinet setup. Either way, match the supply to the fixture datasheet.

Need a checklist? Ask three questions: Is the fixture constant voltage or constant current? What is the rated voltage or current? What is the distance from supply to fixture? Answer those, and the 24V vs 48V decision becomes much easier. At least, that's been my experience with retrofit projects.

Not the most glamorous part of lighting, I know. But it's the difference between an install that works and one that fails at 2 a.m. Take it from someone who reviews the failures.