Flos IC T1 Low Table Lamp Bulb Replacement: My 5-Step Checklist for Lighting Specifiers

Who This Checklist Is For

If you're specifying or maintaining the Flos IC T1 Low Table Lamp—or any designer lamp where bulbs are part of the aesthetic—you've probably encountered the same headache: a client calls because the bulb burned out, and now you need to source a replacement that doesn't ruin the look. Or worse, you ordered the wrong one, spent $45 on shipping, and delayed the project by a week.

This checklist is for interior designers, architects, and lighting specifiers who want to avoid those mistakes. It's short: five steps, one beer's worth of reading. Follow it, and you'll stop wasting time and money on bulb replacements. Trust me—I've burned through both.

The 5-Step Checklist

Step 1: Get the Bulb Type Exactly Right (Not Close)

Let me start with a mistake. September 2022. I had a hotel lobby project using IC T1 Low Table Lamps. The client's facility manager called: "Three bulbs are out. Send replacements." I checked the spec sheet I'd saved from the original order—E12 base, 40W maximum. I ordered E12 bulbs. They didn't fit. The actual socket on the IC T1 uses a G9 base, not E12. E12 is for smaller candelabra bulbs; G9 is a bi-pin base with pins 9 mm apart. I'd assumed they were interchangeable because both are small. Not even close.

The result: $230 for rush shipping on correct bulbs, plus a day of embarrassment when the client's electrician pointed out my error. The lesson: verify the base designation directly on the lamp's ceramic socket, not from a file. For the Flos IC T1 Low Table Lamp, it's G9. Period. Don't guess.

Step 2: Measure the Bulb's Maximum Length Before Buying

Here's something most spec sheets won't tell you: the IC T1's glass diffuser sits close to the socket. If you install a bulb longer than about 60 mm, it can touch the diffuser glass, creating a hot spot—or worse, cracking the diffuser from heat stress. I saw a $3,200 order of five IC T1 lamps get rejected because the client's electrician caught the bulbs were too tall by 8 mm. The fix? I had to buy shorter bulbs. $220 wasted on the first batch.

Standard G9 LED bulbs for the IC T1 typically come in 48 mm to 55 mm lengths. Stick to that range. If you're upgrading from halogen to LED (which you probably should for energy savings), confirm the LED driver in the lamp can handle the lower wattage. Most modern IC T1s have a dimmable driver that's fine with 5W–7W LEDs, but older units might flicker.

Step 3: Check the Dimmability (Not All LEDs Work)

This one's a classic "value over price" lesson. On a project in March 2023, I bought 40 LED G9 bulbs from a budget supplier—$4.80 each, seemed like a steal. Installed them in IC T1 lamps for a boutique hotel lobby. The client's review came back: "They flicker on the lowest dimming setting." Sure enough, they were labeled "dimmable," but the dimming range was only 100% down to 30%. For a lamp that sits on a bedside table at 15–20% brightness, that's a dealbreaker.

I replaced all 40 bulbs with a mid-range brand at $12.60 each. That's $504 more on bulbs, but the client approved the installation, and I avoided a $1,200 redo plus the hotel's delay penalties. If I could redo that decision, I'd check the bulb's datasheet for its dimming curve—specifically, the minimum brightness level. For IC T1s used in dimmable settings, look for bulbs that dim to at least 10% without flicker.

Step 4: Verify the Bulb's Temperature (Warm vs. Cool)

Here's a subtle mistake: ordering bulbs with the right base and size but wrong color temperature. In 2024, I specified 2700K for a residential living room with IC T1 lamps. The client's fixture manager bought 3000K replacements. They looked fine in the shop. At home, they clashed with the cooler daylight from the windows. Another call, another redo.

For IC T1 lamps used in warm-toned interiors, stick with 2700K. For spaces with mixed natural light, 3000K is safer. And for God's sake, get a sample first. I now keep a 5-bulb test kit at my desk—costs $20, saves me from matching errors on every project.

Step 5: Budget for the Total Cost (Not Just the Bulb Price)

This brings me back to my core view: value over price. The cheapest G9 bulb is $3.50. But if it fails in six months and you need to dispatch an electrician to replace it, you've paid $3.50 + $85 service fee + client frustration. That $3.50 bulb cost you $88.50 in total.

In my experience managing over 400 lighting spec orders across five years, the lowest-cost bulbs cause issues in roughly 40% of installations. Usually dimming compatibility or lifespan. I now recommend bulbs that cost $10–15 per unit and are rated for 25,000 hours. Check the manufacturer's warranty—three years or more is a good sign. And don't forget shipping: G9 bulbs are small, but if you order from an overseas supplier and they fail, the return shipping kills you. Local stock is worth the premium.

Common Pitfalls (and How to Avoid Them)

• Assuming the bulb is standard. The IC T1 uses G9, not E12. Always check the socket. Always. This mistake alone wastes hours and hundreds of dollars.
• Ignoring the size constraint. Long bulbs touch the diffuser. Stick with 48–55 mm.
• Skipping the dimming test. "Dimmable" doesn't mean "dims low enough." Get a sample or check the spec sheet.
• Forgetting the color temperature match. 2700K vs 3000K is a big visual gap. Match the existing installation's CCT.
• Buying on price alone. The $4 bulb costs more in the long run. Budget for total cost of ownership, not unit price.

Roughly speaking, $300–500 of my budget has been wasted on bulb mistakes over the past three years. That's annoying. But following this checklist for the last 18 projects? Zero reorders related to bulbs. Worth the 15 minutes it takes to execute.

Pricing note: Bulb costs are based on publicly listed prices on major lighting supply platforms as of April 2025. Prices vary by vendor and region; always verify current pricing.