A US distributor ordered 5,000 "warm white" bulbs for a hotel chain. They received 2700K LEDs from one supplier and 3500K from another. The difference was visible from the lobby. That $22,000 reorder taught them a lesson about spec precision.
In our factory's B2B project data, mismatched bulb specs cause 35% of all order disputes. The problem isn't quality —it's classification. Buyers often don't know which specs actually matter.
This guide covers every major bulb type, base size, and color temperature from a procurement perspective. You'll get the comparison data and checklists you need to order with confidence.
LED vs Incandescent vs CFL vs Halogen: Total Cost Comparison
Four bulb technologies dominate commercial lighting. Each has different efficacy, lifespan, and cost dynamics. The upfront price tells you almost nothing about the real project cost.
| Bulb Type | Efficacy (lm/W) | Lifespan (hrs) | CRI | Mercury |
|---|---|---|---|---|
| LED | 60–30 | 25,000–0,000 | 70–8 | None |
| Incandescent | 12–5 | 1,000–,000 | 97 | None |
| CFL | 30–0 | 8,000–5,000 | 80–4 | Yes |
| Halogen | 15–2 | 2,000–,000 | 95–9 | None |
LED wins on efficacy by a wide margin. A 10W LED delivers the same lumens as a 60W incandescent. Over 50,000 hours, that single fixture saves $150+ in energy.
But incandescent bulbs still have a role. Their CRI of 97 is unmatched for color-critical display lighting. Museums and high-end galleries still use halogen for this reason.
CFL bulbs are the riskiest procurement choice today. Mercury content triggers RoHS compliance costs in EU markets. Many regions are phasing out CFL sales entirely. For new projects, LED eliminates this liability.
When comparing LED lights vs incandescent light bulbs, don't just compare wattage. Calculate total cost of ownership: energy + maintenance + disposal + replacement labor. LED wins every time at scale.
At our factory in Haining, we've manufactured LED bulbs for over 12 years. We've seen CFL projects migrate to LED at a rate of 90% since 2020. The remaining 10% are legacy retrofit commitments that will switch within two years.
Specify luminous efficacy in lm/W, not wattage. Two "10W LED" bulbs can deliver 600 lm or 900 lm. The 60 lm/W bulb costs less but needs 50% more fixtures to hit your lux target. Always compare cost per delivered lumen. For detailed specs, see our LED Buying Guide.
Understanding cost differences is just the starting point. Before you can order, you need to know exactly which base size fits your fixtures.
Light Bulb Base Sizes Explained (E26, E12, GU10, and More)
The wrong base size stops your project cold. Fixtures arrive, bulbs don't fit, and installers stand around waiting. We've seen this add two weeks to project timelines.
Base size is the first spec your supplier should confirm. Here's the complete reference for commercial procurement:
| Base Code | Type | Diameter | Common Use | Region |
|---|---|---|---|---|
| E26 | Medium screw | 26mm | Standard commercial & residential | North America |
| E27 | Medium screw | 27mm | Standard commercial & residential | Europe, Asia |
| E12 | Candelabra screw | 12mm | Decorative, chandeliers, sconces | North America |
| E14 | Small screw | 14mm | Decorative, small fixtures | Europe, Asia |
| GU10 | Twist-lock | 10mm pin spacing | Track lighting, spotlights | Global |
| GU5.3 | Bi-pin | 5.3mm pin spacing | MR16 low-voltage spotlights | Global |
| G13 | Bi-pin | 13mm pin spacing | T8 tube lights | Global |
| G24 | 2-pin/4-pin | 24mm | CFL plug-in lamps | Global |
E26 and E27 are functionally interchangeable in most fixtures. But always specify the exact code on your PO. Mixing E26 and E27 on the same order creates customs documentation headaches.
For decorative projects, E12 light bulb orders need special attention. Candelabra bases are fragile. Specify brass contacts, not aluminum, for better conductivity and longer life.
GU10 vs GU5.3 matters for your transformer budget. GU10 runs on mains voltage (120V/230V) directly. GU5.3 (MR16) needs a 12V transformer. For large commercial projects, eliminating transformers cuts material and labor costs significantly.
At our factory in Haining, we ship roughly 60% of orders with E26/E27 bases, 25% with GU10, and 10% with E12/E14. The remaining 5% covers specialty bases like G13 and G24. Knowing your project's base mix helps plan production lead times.
Once you've matched the base size, the next variable is color temperature. Getting this wrong is what causes those expensive reorder stories.
Color Temperature Guide: Soft White vs Warm White vs Daylight
Color temperature drives the mood of every space. Get it wrong and the entire project feels off. We've seen hotel rooms, retail stores, and restaurants all ruined by wrong CCT selection.
The key distinction: soft white, warm white, and daylight aren't marketing terms. They map to specific Kelvin ranges that affect human perception and behavior.
| CCT Range | Label | Bulb Types Available | Visual Effect |
|---|---|---|---|
| 2700K | Warm white | LED, incandescent, halogen | Cozy, intimate, yellow-amber |
| 3000K | Soft white | LED, halogen, CFL | Warm but cleaner, slightly bright |
| 4000K | Neutral white | LED, CFL | Balanced, neither warm nor cool |
| 5000K | Daylight | LED, CFL | Crisp, bright, slightly blue |
| 6500K | Cool daylight | LED | Stark white, clinical |
Soft white light bulbs (3000K) are the safe default for hospitality. They flatter skin tones and food without looking dim. If your client says "warm but not yellow," 3000K is the answer.
A warm white light bulb at 2700K matches traditional incandescent output. Use it when replacing incandescent bulbs in existing fixtures. Guests won't notice the switch from incandescent to LED.
The 2700K light bulb is your go-to for hotel rooms. But avoid it in office spaces and retail electronics —the warmth reads as dim and unprofessional in those contexts.
For B2B orders, always specify MacAdam 3 SDCM or tighter. Without this, you'll get color inconsistency between batches. Two "3000K" bulbs from different production runs can look noticeably different.
At our factory in Haining, we use integrating sphere photometers to verify every batch. Each production run gets a color consistency report before shipping. If your supplier can't provide MacAdam binning data, you're accepting invisible quality risk.
Color temperature sets the mood –but matching bulb types to applications is where procurement decisions hit the bottom line. The next section maps each bulb type to its ideal commercial use.
Where Each Bulb Type Belongs in Commercial Projects
Different bulb types serve different commercial needs. Matching bulb type to application is where procurement decisions directly impact project outcomes.
| Application | Recommended Bulb | CCT | Key Spec |
|---|---|---|---|
| Hotel guest rooms | LED (E26/E12) | 2700K | Dimmable, CRI 90+ |
| Retail fashion | LED track (GU10) | 3000K | CRI 90+, R9 ≥0 |
| Office spaces | LED panel/tube (G13) | 4000K | UGR < 19, PF > 0.9 |
| Warehouse | LED high bay | 5000K | IP65, motion sensor |
| Restaurant dining | LED (E12/E26) | 2700K | Dimmable 1–0% |
| Museum/gallery | Halogen or high-CRI LED | 3000K | CRI 95+, UV-free |
| Parking garage | LED tube (G13) | 5000K | IP65, IK08 |
| Outdoor facade | LED wall wash | 3000K | IP65+, 24°–° beam |
Notice that CFL bulbs don't appear in this table. For new commercial installations, CFL offers no advantage over LED. The mercury compliance burden alone makes CFL a poor procurement choice.
For retrofit projects where CFL fixtures already exist, plug-in LED replacements are available for G24 bases. This lets you upgrade without replacing the fixture. Just verify the ballast is bypassed or compatible.
Halogen still has a narrow niche. Galleries and museums value its CRI 95–9 and perfect dimming curve. But even there, high-CRI LED (Ra 95+) is closing the gap fast. The ENERGY STAR program now lists LED replacements for most halogen form factors.
With the right bulb type matched to each application, you're ready for the final step –the 10-spec procurement checklist that prevents costly order errors.
B2B Procurement Checklist: 10 Specs to Verify
Before you sign off on any bulb order, verify these specs with your supplier. If they can't provide test data, find another supplier.
- Bulb type: LED, halogen, CFL, or incandescent —matched to application
- Base size: Exact code (E26, E12, GU10, G13, etc.) on PO
- Luminous efficacy: 60–30 lm/W for LED; request IES test report
- CCT specified: Exact Kelvin value (2700K, 3000K, 4000K, 5000K)
- CCT tolerance: MacAdam 3 SDCM or tighter
- CRI: Ra 90+ for retail/display, Ra 80+ for general use
- Wattage & lumens: Compare lm/W, not just wattage
- Voltage: 120–77V universal input for North American projects
- Lifespan: L80/B10 at 25°C, 25,000+ hours (LM-80 + TM-21)
- Compliance: RoHS, Energy Star, DLC (for rebate eligibility)
Each spec exists because we've seen projects fail without it. The MacAdam requirement came from a hotel project where two batches of 2700K bulbs looked different in the same hallway. The client refused payment on 3,000 units –a $14,000 loss.
The compliance line item matters for rebates. ENERGY STAR and DLC-listed bulbs qualify for utility rebates in many US states. That rebate can cover 20–0% of your fixture cost.
Always request a 10-unit sample before bulk orders. Test for color consistency, fit, and dimming performance. A $200 sample order prevents a $20,000 mistake.
These 10 specs form the backbone of every successful types of light bulbs order. But buyers still have common questions –the FAQ below covers the ones we hear most.
Frequently Asked Questions
LED bulbs are the most efficient, delivering 60–30 lm/W in production. Compare this to incandescent at 12–5 lm/W and CFL at 30–0 lm/W. For B2B projects, LED's efficiency advantage means 60–0% lower energy costs versus incandescent.
E26 has a 26mm screw diameter and is the standard medium base in North America. E12 has a 12mm diameter and is the candelabra base for decorative fixtures like chandeliers. Always verify base type with your fixture spec sheet before ordering.
Many regions are phasing out CFL bulbs due to mercury content. The EU restricted most halogen and CFL sales since 2018. For new commercial projects, LED is the clear forward choice —it eliminates mercury compliance issues entirely.
2700K is warm white, producing a yellow-amber tone similar to incandescent light. It suits hospitality and dining spaces. For commercial projects, pair 2700K with CRI 90+. Avoid 2700K in offices or warehouses where cooler temperatures improve visibility.
Yes, in most cases. LED replacements match halogen form factors for MR16, GU10, and PAR sockets. Check three things: physical fit, transformer compatibility for low-voltage halogen, and dimmer compatibility. Always request a sample before bulk ordering.
Need help specifying the right bulbs for your project?
Our team can match bulb types, base sizes, and color temperatures to your application. Free spec review and fixture count calculation for commercial projects.
What to Do Next
Choosing the right types of light bulbs is about matching technology, base size, and color temperature to your project's actual needs. LED dominates commercial procurement for good reason –efficacy, lifespan, and compliance.
But procurement success lives in the specs. Base codes, MacAdam tolerance, CRI minimums, and compliance certifications are what separate a smooth project from a costly callback. Use the 10-spec checklist on every order.
At Tonghua Lighting, we provide full test data on every bulb we ship from our Haining factory. No guesswork, no surprises. If your current supplier can't answer all 10 checklist items, it might be time for a new one.
