Longyear Museum – Dupee Estate–Mary Baker Eddy Home
Project Description
Property History
The landmark Mary Baker Eddy Historic House was built circa 1880 at 400 Beacon Street in Chestnut Hill, Massachusetts. The prestigious Boston firm Peabody and Stearns designed the building. In 1907, Mary Baker Eddy, founder of Christian Science, purchased the property and oversaw extensive remodeling under the supervision of Chicago architect Solon S. Beman. On September 4, 1986, officials added the property to the National Register of Historic Places.
Project Description
As part of an extensive restoration of the property, the owners commissioned Grand Light to restore nearly 200 vintage wall sconces, chandeliers, pendants, and other fixtures. Additionally, Grand Light manufactured historically accurate replicas based on archived photos to replace missing fixtures.
Many of the historic fixtures in the Mary Baker Eddy Home originally operated on gas before being decommissioned, necessitating the conversion to electric power. Grand Light electrified each gas fixture without compromising the original design or mechanics of the luminaires. Grand Light also fully rewired the existing electric fixtures using new UL-listed components.
The renovation team spent nearly a decade restoring 400 Beacon Street to its historically accurate condition, relying on hundreds of period photographs, blueprints, and other records. As the house reopens to the public, Grand Light proudly celebrates its work restoring the historic lighting fixtures and manufacturing new period-appropriate lighting and replicas.
Services Performed
On-Site Disassembly, Assembly, & Testing
Our restoration artisans are trained to safely remove and disassemble fixtures and components, labeling and photographing fixture components in sequence of its removal and as a section. Work areas are left in the same condition it was found prior to leaving the site.
For documentation our technicians inspect and note any electrical deficiencies on every lighting fixture prior to any electrical component replacement and rewiring, to ensure the fixtures can be wired in accordance with UL listed products, UL standard 1598 and hi-pot tested, with UL label (LED retrofit kits utilize manufacturers listing).

On-Site Packing, Crating, & Transportation
Grand Light frequently transports lighting fixtures using our own box trucks, flatbeds, and custom-built trailers that are designed specifically for safe transport. Our team packs all components with custom-built crates catered to each fixture in our factory. Each crate is packed and properly labeled with all necessary information per fixture type, including loose components, damages/deficiencies, and proper component placement/alignment.

Material Fabrication
Grand Light has created custom lighting fixtures of every style and for every application. Our team of professional metal workers excel in Forming, Forging, Spinning, Stamping, and Hydroforming various materials such as Steel, Aluminum, Stainless Steel, Brass, Bronze, and Copper.
Grand Light’s production process in machining and manufacturing custom lighting fixtures and components in both large and small quantities; from minor components to the complete fabrication of full sized lanterns or other custom lighting fixtures, our artisans can accommodate any client specification or deadline.
With our automated lathes, stamping, and welding equipment aid in our ability to craft metal components to project specification with unparalleled design, quality, and durability. Our custom lighting team stands confidently behind their work with years of experience and dedication to quality craftsmanship.
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Glass, Crystal, & Acrylic
Grand Light’s Crystal, Glass, & Acrylic Studio specializes in the cleaning, repair, fitting, custom fabrication, replacement and replication of crystal, glass, and acrylic components of varying types, sizes, and color.
Our extensive cleaning solutions include hand cleaning, abrasive, micro-abrasive, and ultrasonic cleaning technology. Our artisans utilize a proprietary cleaning solution before each component is rinsed and hand polished. We have extensive experience pinning and stringing crystal components on historic and custom lighting fixtures. Utilizing time proven techniques, our artisans install pinning wire, clips, and connecting rings on crystal components in a wide variety of sizes, shapes, and designs.
Our specialists will identify and research any missing crystal or glass component on a historic lighting fixture and offer up a similar or exact grade, size, tint, color, and shape to maintain a fixtures historical integrity.
Grand Light offers a wide variety of custom, high quality architectural glass and acrylic diffusers, available in an array of styles, types, and sizes. Our high quality architectural diffusers are available by custom order and offer unique, one-of-a-kind pieces or replications of an existing design.
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Cleaning Systems
Grand Light specializes in commercial luminaire cleaning services, including the utilization of state-of-the-art Ultrasonic, Micro-Abrasive, and Hydrosonic Molecular Impact System (HSMI) Cleaning Technologies. Using our engineered cleaning systems, our artisans are able to eliminate decades of accumulated debris from any lighting fixture or surface.
Grand Light’s Industrial Ultrasonic Cleaning Tanks provide high-frequency sound waves transmitted through liquid to scrub clean the surface of immersed parts. The high-frequency sound waves, typically 40 kHz, agitate the liquid solution of water or solvent, and cause the cavitation of solution molecules.
Our Micro-Abrasive process utilizes fine abrasive media to generate an accurate, precise, and controllable abrasive jet to target and remove material (on the micron level). Our system is so precise it can remove ink from a business card without damaging the card’s surface.
HSMI is Grand Light’s unique, proprietary system includes powerful continuous super high steam production up to 369 degrees Fahrenheit with an integrated wet vacuum system insuring residual moisture and debris extraction. Purified dry vapor steam and integrated vacuum system guarantees spot free crystals and fixture frames.
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Surface Preparation
Grand Light specialists perform testing on each fixture to determine the optimal surface profile for powder coat, paint, metal oil, or hot/cold patina application. Our processes utilize a wide range of equipment including Pyrolysis, Burn-Off, Thermal, and Blast Cabinets to remove an existing finish and smooth or roughen a surface.
Our industrial Pyrolysis, Burn-Off, Thermal Ovens and Heaters offer high-temperature, controlled burns for removal or vaporization of finish or foreign material from metal surfaces. Any remaining ash is removed through our blast cabinet services.
Our industrial Media Blast Cabinets are generally used to remove existing material (finish, contaminants, rust, etc.) or smooth/roughen a surface, all without causing damage to the original profile and aesthetic elements. Each cabinet houses a large work area and adjustable turn table to easily maneuver fixture frames and components.
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Finish Application & Top Coatings
As a part of the restoration process, our artisans explore the intricate details of preserving the historical integrity of lighting fixtures including color matching and sheen of the original finish. Custom lighting finishes are available in custom painted colors, sheen, and textures as well as custom patina colors on bronze, copper, and brass components.
Our artisans can match any color or finish utilizing a variety of processes involving Powder Coat, Spray, Hot or Cold Patina Custom Recipes and Color Blending an existing finish.
Grand Light exercises meticulous techniques that are unparalleled in the application of Protective Top Coatings including binders, rust, and UV resistant protective metal oils, waxes, and lacquers with various customized sheens and tints.
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LED Energy-Efficient Systems
Our Energy-Efficient LED Advantage Systems update the lighting element, wiring, and components to significantly increase the lighting quality of an area while minimizing total energy consumption and reducing maintenance costs. When incandescent lamps are upgraded to an LED system, the result is a room that is up to (3) times brighter, savings up to 80% in annual(recurring) energy costs, and extended operational lifespan.
Improvements can also be achieved through the implementation of photometric testing, intelligent controllers, photocells, motion detectors, and light lifts. All of these, often in combination, can significantly reduce operating costs and provide long term return on investment.
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NRTL Testing & Listing
Utilizing only UL listed products, Grand Light’s OSHA NRTL Certified Manufacturer’s Testing and Listing Laboratory strives to ensure only the highest quality of standards go into finalizing each lighting fixture; from the rewiring of luminaires, to the installation of modern lamp technology, and the custom conversion of gas powered fixtures to electric.
Grand Light’s technicians inspect and document any electrical deficiencies on every lighting fixture prior to any electrical component replacement and rewiring. We also offer comprehensive retrofit kits for upgrading existing historic luminaire to take full advantage of modern induction lamping technology. Grand Light’s practice is to perform multiple UL tests on all electrical components and systems to ensure compliance with UL Standards for luminaires.
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Media

We custom modified the existing gas components in most of the fixtures to accommodate the new UL-listed components and tested them in accordance with UL 1598 standards.
Project Updates

History Made New – The Restoration Of The Mary Baker Eddy Historic House
Congratulations to Longyear Museum’s Mary Baker Eddy Historic House renovation and grand reopening! The nearly decade-long renovation succeeded in historically accurate restoration of 400 Beacon Street based on hundreds of period photographs, blueprints, and other records. As the house reopens to the public, Grand Light is proud to have restored the historic lighting fixtures and…
Project Accolades
The Mary Baker Eddy Historic House received the 2025 Preservation Award from the Victorian Society in America
The Mary Baker Eddy Historic House received the Paul & Niki Tsongas Award at the 2025 Preservation Awards hosted by Preservation Massachusetts
The Mary Baker Eddy Historic House received the 2024 Historic Preservation Citation at the AIA Rhode Island Honor & Design Awards
































