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FocusFlow Tech
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High-performance sealed-beam LED replacement headlight in a standard universal 4x6-inch format. Specifically engineered to upgrade lighting systems for Mack heavy-duty commercial trucks.
Technical Specifications:
- Industrial Standard Size: 4" x 6" (Direct replacement for OEM Trade Numbers: H4651, H4652, H4656, H4662, H4666, H4668, H4739, H5051, H5062, H6545)
- Technology: High-Power LED
- Color Temperature: 3000 Kelvin (Classic yellow beam, preserving the authentic vintage look while delivering modern light output and night visibility)
- Beam Application: Dual-function integrated — Low Beam and High Beam
- Wiring: Standard H4 connector (Direct plug-and-play installation into the truck's factory harness, no modifications required)
- Certifications: DOT and SAE compliant (100% street legal on public roads)
Direct Fitment:
Fits seamlessly into classic Mack trucks utilizing the traditional 4x6-inch rectangular headlight housings.
✓ Secure payment in 3x or 4x installments
✓ Flexible solutions available at checkout
✓ Buyer protection included
Guarantee of excellence & strict compliance
© 2026 FOCUSFLOW-TECH. ALL RIGHTS RESERVED.
Have a question about our heavy-duty lighting? Need expert advice for your rig? Our team is ready to assist you.
We answer all inquiries in less than 24 hours, Monday through Friday.
| Monday - Friday | 9:00 AM - 4:00 PM EST |
| Saturday | Closed |
| Sunday | Closed |
FocusFlow Policy
New, uninstalled, and unmodified parts can be returned within our return window. Start your process online or contact our team for assistance.
Return Policy
Products must be new, unused, and in their original packaging with all documentation included.
Installed, mounted, or modified products showing any signs of use cannot be returned.
• AnzoUSA (Anzo): Items undergoing structural alterations, wire-splicing, or socket pin modification fail manufacturer policy audits and are instantly rejected.
• AlphaRex (Alpha): To protect fragile clear assemblies from surface hairline scuffs, lens scratch protective sheets must remain fully unpeeled. All returns require complete factory dual-box systems.
Damaged packaging or missing components may be subject to a refusal of the return. All original boxes and paperwork must be included.
Free premium gifts distributed during order programs are permanent and cannot be returned or exchanged. If you return your headlight assembly for a monetary refund, the gift item stays with you, and its verified retail market value will be automatically and non-negotiably deducted from your final product refund.
Fill out the RMA form below with your order details.
Our team will review your request and send shipping instructions.
Return the item in its original box with all documents.
Allow 10-14 days for inspection and bank processing.
Attention Drivers
Following these policies prevents delays and complications.
Need a different model? Email support@focusflowtech.com with your order number. Clearly mark "EXCHANGE" on the outside of your return box to speed up processing.
We process orders fast. You can cancel before the shipping label is created. Once it's in the carrier's hands, the standard return policy applies.
Any assembly exhibiting road grime, terminal scuff marks, headlight housing wire-trimming, or unpeeled outer protective layer film manipulation cannot be refunded.
Returns from Canada must be marked as "Return of Merchandise". Any customs fees or brokerage charges incurred are the responsibility of the customer.
Our team will review your photos and data within 24 hours. Once verified, you will receive an official **RMA Number** and precise shipping instructions.
⚠️ Do not ship items back without an approved RMA number.
Upon arrival at our US warehouse, parts undergo a physical quality check. Approved uninstalled items are refunded or exchanged within **3 to 5 business days**.
Need help? support@focusflowtech.com →PREMIUM OPTICS • PRO SERVICE
At FocusFlow Tech, we don't just sell lights. We deliver the clarity and reliability you need to get home safe, every single night. No excuses, just performance.
We only collect essential device info, cart activity, and order details to process your parts.
Your financial transactions are 100% guarded via top-tier military-grade SSL encryption protocols.
You hold full rights to access, update, or completely erase your personal information at any time.
FocusFlow Tech operates this store and website. This Privacy Policy describes how we collect, use, and disclose your personal information when you visit, use, or make a purchase from focusflow-tech.com (the "Site").
When you visit the Site, we collect certain information about your device, your interaction with the Site, and information necessary to process your purchases. We may also collect additional configuration info if you contact us for custom customer support.
As part of our commitment to authentic product provisioning for AnzoUSA and AlphaRex assemblies, encrypted hardware verification checks are safely parsed. Your operational and fitment vehicle specifications are securely stored alongside order numbers to systematically authenticate your manufacturer hardware warranties and block unauthorized counterfeit distribution lines.
We use your personal information to provide our services to you, which includes: offering products for sale, processing payments, shipping and fulfillment of your order, and keeping you up to date on new products, services, and offers.
We prioritize the security of your data. We use SSL encryption to protect your financial information during transactions. We retain your personal information for our records unless and until you ask us to erase this information.
If you are a resident of certain jurisdictions, you have the right to access the personal information we hold about you and to ask that your personal information be corrected, updated, or erased.
For more information about our privacy practices, if you have questions, or if you would like to make a complaint, please contact us by e-mail at:
Please read these terms carefully before accessing or using our store. By purchasing, you buy certainty, legal compliance, and elite performance.
By agreeing to these Terms of Service, you represent that you are at least the age of majority in your state or province of residence, or that you have given us your consent to allow any of your minor dependents to use this site.
You may not use our products for any illegal or unauthorized purpose nor may you, in the use of the Service, violate any laws in your jurisdiction (including but not limited to copyright laws). You must not transmit any worms or viruses or any code of a destructive nature.
Prices for our premium automotive optics are fixed and mandatory as displayed at checkout. We do not offer price matching, retrospective discounts, or post-purchase negotiations. We reserve the right at any time to modify or discontinue the Service (or any part or content thereof) without notice at any time.
• Distribution Enforcement (Anzo & AlphaRex): As an authorized logistics distributor of AnzoUSA and AlphaRex assemblies, pricing grids stringently align with Minimum Advertised Price (MAP) protocols mandated by the factories. Unauthorized dealer sub-discounts are systematically restricted.
Certain products or services may be available exclusively online through the website. We have made every effort to display as accurately as possible the colors and images of our products that appear at the store, but we cannot guarantee your monitor's display will be completely accurate.
• Technical Aesthetics Note: High-performance optics configurations can undergo internal structural DRL layout patterns or light calibration behavior adjustments according to your vehicle's trim level variant. Review installation diagrams carefully.
All complimentary high-performance gear or premium items distributed as gifts within specific order programs are permanent. In the event of a product return and subsequent monetary refund request, the gift item cannot be processed as a return. Its full verified retail value will be automatically, definitively, and non-negotiably deducted from the total refundable amount.
We reserve the right to refuse any order you place with us. We may, in our sole discretion, limit or cancel quantities purchased per person, per household or per order. These restrictions may include orders placed by or under the same customer account, the same credit card, and/or orders that use the same billing and/or shipping address.
We may provide you with access to third-party tools over which we neither monitor nor have any control nor input. Third-party links on this site may direct you to third-party websites that are not affiliated with us. We are not responsible for examining or evaluating the content or accuracy.
Occasionally there may be information on our site or in the Service that contains typographical errors, inaccuracies or omissions that may relate to product descriptions, pricing, promotions, offers, product shipping charges, transit times and availability. We reserve the right to correct any errors, inaccuracies or omissions.
We do not guarantee, represent or warrant that your use of our service will be uninterrupted, timely, secure or error-free. In no case shall FocusFlow Tech, our directors, officers, employees, or affiliates be liable for any injury, loss, claim, or any direct, indirect, incidental, punitive, or consequential damages of any kind.
These Terms of Service and any separate agreements whereby we provide you Services shall be governed by and construed in accordance with the laws of the United States.
You can review the most current version of the Terms of Service at any time at this page. We reserve the right, at our sole discretion, to update, change or replace any part of these Terms of Service by posting updates and changes to our website. It is your responsibility to check our website periodically for changes.
Our corporate legal and support staff is ready to assist you.
⚡ FREE SHIPPING ON ALL US ORDERS — NO MINIMUM REQUIRED ⚡
At FocusFlow Tech, we believe in transparent pricing. That’s why fast shipping is automatically included in your order at absolutely no extra cost. We partner with top-tier carriers to get your lighting equipment delivered safely.
Instant automated security verification.
Packed & inspected at our logistics center.
2 TO 5 BUSINESS DAYS
Fast dispatch directly to your doorstep.
| DESTINATION REGION | ESTIMATED DELIVERY | SHIPPING COST |
|---|---|---|
| All United States (Domestic Orders) | 2 - 5 Business Days | FREE SHIPPING |
| Military Addresses (APO/FPO) | 7 - 14 Business Days via USPS | FREE SHIPPING |
Orders placed before 2:00 PM EST Monday through Friday are processed and transferred to our shipping carriers within 24 hours. Orders placed over the weekend or on official US holidays will be processed on the following business day.
To protect delicate lighting assemblies from transit vibration or seal disruption, our warehouses enforce advanced shock-absorption casing protocols for all AnzoUSA and AlphaRex assemblies. High-performance housings are dispatched in double-walled secure freight boxing formats, ensuring pristine out-of-the-box structural delivery during the 2-5 days transit window.
As soon as your package leaves our fulfillment warehouse, an automated email and SMS notification will be sent to you containing your tracking number (UPS / FedEx / USPS). You can monitor your shipment every step of the way directly on our platform.
Every light we ship is fully insured. If your order is lost in transit or arrives damaged, our dedicated US team will dispatch a replacement immediately. No hassle, no stress.
ABOUT FOCUSFLOW TECH
High-end LED solutions. We ensure every car, SUV, and light truck owner drives with confidence through products that meet the highest standards.
OUR MISSION
OUR STORY
We are first and foremost automotive optics enthusiasts. We realized that the elite-quality, compliant headlights required for maximum road safety were nearly impossible to find with guaranteed technical specifications.
From one driver to another, every product in our catalog exists to deliver uncompromised styling and ultimate performance on the road. We listen, we learn, and we deliver professional-grade lighting solutions for passenger cars, SUVs, and light trucks.
Core Values
Every product and every conversation is guided by the same set of standards.
We want you fully satisfied. From secure checkout to fast delivery and expert tech help, every step is designed to support the driver.
We analyze every situation from the driver’s perspective. If you have a problem, we handle it the way we’d want our own gear handled.
Buying online shouldn't be impersonal. We provide clear info before the sale and real human assistance after it’s delivered.
We listen to your feedback on the road to find lights that are easier to install, more durable, and perfectly adapted to rugged daily driving and custom builds.
If we commit to a spec or a delivery time, we stand by it. If something isn't right, we don't make excuses—we fix it immediately.
Every product must meet FocusFlow Tech’s excellence standards. We don't sell junk; we sell DOT-compliant reliability for every dark road ahead.
Why we don't focus on "Customer Reviews":
We deal exclusively with everyday drivers, styling enthusiasts, and fleet managers. You don't need a star-rating system to know if a headlight assembly is DOT-compliant or if it fits your specific vehicle generation perfectly. You need technical accuracy, precise plug-and-play engineering, and a product that survives the harshest environments. We let our specs and our build quality do the talking.
FocusFlow Policy
ENGINEERED FOR THE ROAD, NOT FOR THE LIKES.
Have any questions?
Whether it's a technical question about DOT compliance or a precise compatibility check for your specific passenger car, SUV, or light truck model, our team has the answers.
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