US Market Sleep Bulb Customization: Blue-Free CRI98 Switch Dimming | Lumin OEM Case Study

1. Client Requirement: A Truly "Sleep-Friendly" Bulb

In April 2026, we received a custom inquiry from a UK-based client.

This client had a unique business setup — headquarters in the UK, target market in the US. They were developing a sleep-friendly lighting product for American consumers and needed an LED bulb that could truly help users improve sleep quality.

Their core requirements were very clear:

"I need a blue-light-free bulb with high CRI, and it must support dimming and color temperature adjustment using a standard wall switch — no smart home system required. Users should be able to use it right out of the box."

Why "blue-light-free"? Because blue light suppresses melatonin secretion and disrupts sleep. US consumers have high awareness of healthy lighting, and a "sleep-friendly" bulb has clear market demand on channels like Amazon.

Why "switch dimming and tunable white"? Because not every home has a smart home system. Using a standard switch to adjust color temperature and brightness — lowest barrier to entry, widest user coverage.

2. Challenges: Three "Hard Requirements"

The client's requirements seemed simple, but each posed a technical challenge:

Challenge 1: Blue-light-free while maintaining efficacy

Traditional LED chips have high blue light content. Achieving "blue-light-free" requires special treatment at the source — either special phosphor formulations or filtering technology. Both affect efficacy. The client's requirement: blue-light-free, but brightness cannot be too low.

Challenge 2: CRI≥98 for true color rendition

The client demanded a color rendering index ≥98Ra. For context, typical household LED bulbs have CRI between 80-90. CRI≥98 means color accuracy close to natural light — museum or art gallery grade. There is a technical trade-off between high CRI and blue-light-free, requiring a careful balance in spectral design.

Challenge 3: Switch-controlled dimming and tunable white with 4-step cycling

The client required 4-step color temperature cycling using a standard wall switch: first power-on lights up in the last used mode; switch off/on within 1-2 seconds to cycle to the next mode; after 5 seconds of power-off, the current mode is memorized. Double-clicking the switch (between 1-2 seconds) resets to the initial mode.

This required developing a pure switch-controlled dimming and tunable logic — no remote control, no app, no gateway. Users operate it with their existing wall switch.

3. Solution: From Concept to Mass Production

Step 1: Spectral Design — Blue-Free + High CRI

Our engineering team approached the challenge at the spectral level, using special phosphor formulations to reduce the blue light peak while maintaining spectral integrity. The final product achieved CRI≥98Ra with no blue-light hazard.

Test results:

• In 2700K mode, CRI reached 98.0Ra, with R9 (red rendition) at 92 and R15 (skin tone) at 98

• In 4000K mode, CRI reached 91.4Ra

• In 2020K warm mode, CRI reached 92.7Ra

Step 2: Switch Control Logic — 4-Step Cycling, Plug & Play

We developed a pure switch-controlled 4-step dimming and tunable white solution:

Operation	Function
First power-on	Lights up in the last used mode
Off → On (within 1-2 seconds)	Switches to the next color temperature mode
Power off ≥5 seconds then restart	Automatically memorizes and saves current mode
Double-click (between 1-2 seconds)	Resets to initial mode

Users don't need to learn complex app operations or purchase additional controllers — all control is done with their existing wall switch.

Step 3: US Market Adaptation — E26 Base + 100-240V Wide Voltage

The standard bulb base in the US is E26 (while Europe and Asia commonly use E27). We customized the bulb with an E26 base for direct installation in US standard fixtures.

The product also supports AC100-240V wide voltage input — compatible with US residential 120V or commercial 277V.

4. Final Product Specifications

Key parameters of the delivered custom bulb:

Four Color Temperature Modes:

5. Client Feedback and Market Performance

After product delivery, the client highly praised our response speed and technical capability. The entire cycle from requirement consultation to sample delivery was just 25 days.

Client feedback:

"The Lumin team's expertise in spectral design is truly impressive. They delivered on all three of our core requirements — blue-free, high CRI, and switch control. Most importantly, they went from concept to sample in under a month — which was critical for our US market product launch timeline."

The product is now available in the US market through the client's channels, targeting health-conscious consumers, individuals with sleep concerns, and families who prioritize quality lighting environments.

6. Why Choose Lumin for OEM Customization?

1. Spectral Design Capability
From blue-free formulations to CRI≥98 high color rendering, our engineering team has deep expertise in the underlying design of LED spectra, capable of customizing specific spectral curves to client requirements.

2. Switch Control Logic Development
No app, no gateway, no remote — complex dimming and tunable logic is achieved with a standard switch. This "low-barrier" smart lighting solution is ideal for clients targeting the mass market.

3. Global Market Adaptation
From E26/E27 bases to 100-240V wide voltage, from CE/ROHS to UL/FCC certifications — we are familiar with product standards across major global markets and can deliver turnkey customized solutions.

4. Fast Response
From requirement consultation to sample delivery — 25 days. In a fast-changing market, time is competitiveness.

7. Conclusion

This sleep bulb customization case demonstrates Lumin's core capabilities in OEM/ODM — not simply "manufacturing to print," but full-chain custom services from spectral design and control logic to market adaptation.

Whether you're developing differentiated products for specific markets or need to rapidly move from concept to mass production — Lumin provides professional technical support and flexible customization solutions.

Want to learn more about Lumin's OEM customization services? Download the Lumin product catalog or contact our OEM business team for a tailored solution.

📞 Contact Us

📍 Address: F3, Building 1, Baolu Technology Park, Shiyan Street, Bao'an District, Shenzhen, Guangdong, China
📧 Email: info@luminlight.com / sz@luminlight.com
📱 Phone: +86 15875556677