I used to be a unit-price buyer
When I took over purchasing for our office in 2020, I'll admit—I was looking at one thing: the price per fixture. The $42 downlight vs. the $51 one? Easy choice, right?
I was wrong. Seriously wrong. And it cost us.
Here's what I learned the hard way: the cheapest quote is almost never actually the cheapest. The total cost of ownership (TCO) is what matters. And once I started calculating TCO before any lighting purchase, I started saving real money.
The real cost of the 'cheap' light
Let me give you a concrete example. In mid-2023, I had to replace 60 downlights across three office corridors. Vendor A quoted $38/unit. Vendor B (a GE Current authorized distributor) was at $51/unit. Looked like a savings of $780, simple math.
Here's what happened:
- Vendor A's fixtures arrived but two of thirteen boxes looked crushed. Replacement took one week.
- The units didn't include compatible dimming drivers (ugh). Spec sheet said 'standard' but 'standard' meant different things to us and to them.
- We had to buy separate drivers from another vendor—at $14 each, plus rush shipping.
- Installation took longer because electricians had to rework the housing. That was an extra $400 in labor.
- After six months, three failed. Warranty support was a two-week email chain.
Final bill: $3,920 vs. the $3,060 from Vendor B.
Yes, the 'cheaper' fixtures cost us $860 more. Plus headaches, plus time. (This was back in 2023, thankfully.)
A quick TCO framework I now use
After that fiasco, I built a simple TCO calculator in a spreadsheet. It's not fancy, but it works:
- Unit price — What they quote
- Hidden add-ons — Shipping, setup, revision fees (like that dimmer issue)
- Time cost — My team's hours spent dealing with replacements or rework (I value my time at about $50/hr in these calculations)
- Risk cost — Potential warranty failures, stockout delays, compliance issues
- Energy & maintenance — Especially for commercial lighting running 10+ hours a day
I then compare total cost, not unit cost. It's saved us roughly $3,000 annually across all our lighting and electrical purchases (as of Q3 2024).
What most people miss when buying lighting
This isn't just about downlights. It applies to everything from under-cabinet fixtures to high bays to emergency lighting. Here are the hidden costs I routinely see:
- Compatibility gotchas. Smart lighting (Zigbee, Cync) sounds easy until you realize the cheap bulb doesn't pair with your hub. Suddenly you're buying adapters or replacing hubs.
- Dimming mismatches. Not all dimmable specs are equal. I've seen $8 bulbs buzz on a $60 dimmer. That's a redo cost.
- Shipping damage. Lighting fixtures break. If the vendor doesn't drop-ship with proper packaging, expect 5-10% replacement rate. (I learned that assuming specification is identical across vendors doesn't work — turned out each had slightly different interpretations.)
- Warranty support costs. 'Warranty' sounds great until you have to pay return shipping, wait three weeks, and handle the paperwork yourself. Some vendors (like GE Current) offer on-site replacement for commercial orders. That's a TCO advantage.
None of these show up on the invoice.
The objection I hear: 'My boss only cares about unit price'
I get it. I've said it myself. The finance team sees a PO with a $38/unit price and approves it. The $51/unit one? They want justification.
Here's my counter-argument (and it works): calculate the TCO for both options, show the comparison, and present it as a risk assessment, not just a cost comparison. Say: 'Option B costs 24% more upfront, but it includes dimming drivers, better warranty support, and lower failure risk. Worst case, Option A costing us $860 more. Best case, Option B breaks even. The data says Option B is the safer bet.'
Once I showed our VP the actual cost comparison from the downlight fiasco, she became a TCO convert. Now it's standard procedure before any order over $500.
As of January 2025, I never approve a supplier purely on per-unit price. I run the TCO model, factor in my experience (five years of managing these relationships, processing 60-80 orders annually), and make a decision based on the real cost.
The cheapest fixture isn't a bargain if it fails in 18 months or takes two weeks to replace. Think total cost, not unit price.