Light Reflectance Value
Every paint colour has a Light Reflectance Value (LRV) — a number from 0 (absorbs all light) to 100 (reflects all light). Pure white paints typically have LRVs between 80 and 90. Mid-tone colours sit in the 40–60 range. Dark colours can be below 10.
In a room where natural light enters from one side, the ceiling and the walls adjacent to the window are the primary surfaces responsible for bouncing light into the back half of the room. A ceiling painted in a colour with an LRV below 60 absorbs a significant fraction of the light that first hits it, reducing the amount available for secondary reflections deeper in the space.
For a cottage room with limited window area, using a ceiling colour with an LRV of 80 or above makes a measurable difference. The walls parallel to the window direction matter more than the wall the window is in — they are the surfaces that reflect light laterally into the room's interior.
Paint Sheen and Reflectance
Paint finish (matte, eggshell, satin, semi-gloss) affects the character of reflection rather than primarily the total amount of light reflected. A matte finish scatters light diffusely in many directions; a gloss finish reflects it specularly (mirror-like). For maximizing overall room brightness, matte and eggshell finishes on ceilings are generally preferred — they distribute reflected light widely without introducing glare. High-gloss finishes on ceilings can cause uncomfortable direct reflections of the window or skylight aperture.
Ceiling Height and Geometry
A higher ceiling increases the volume of reflected light available. More critically, it places the ceiling further from the work plane, allowing reflected light to spread more widely before reaching the occupants' level. Cathedral ceilings — common in Canadian cottage construction — extend the space above the window head height, allowing light from the upper portion of the window to travel into the room at a shallow angle that reaches further from the window wall.
Ceiling coffers, beams, and dropped sections interrupt the path of reflected light. A dark-stained exposed timber ceiling, characteristic of many traditional cottage interiors, absorbs a large proportion of incoming light. Painting or whitewashing existing dark beams — even a mid-tone white — recovers significant reflectance. The structural appearance can be retained while the optical performance improves substantially.
Practical Note
In log cabin or tongue-and-groove cottage interiors where ceiling finishes cannot be changed, a suspended white fabric panel at an angle above a desk or kitchen counter can locally redirect daylight toward a work surface without affecting the overall room appearance.
Floor Materials
The floor is the largest horizontal surface in most rooms, and horizontal surfaces are where incoming daylight ultimately lands before being absorbed or reflected upward again. A light-coloured floor reflects some of that light back up toward the ceiling for a second bounce, effectively recycling it into the room. A dark floor absorbs it.
In cottage applications, the choice often comes down to light vs. dark wood flooring, or light tile vs. stone. Light ash, maple, or whitewashed pine flooring reflects noticeably more light than dark walnut or stained oak. This is particularly meaningful in rooms that are deeper than roughly 2× the window head height, where the floor-to-ceiling light bounce is one of the main paths by which light reaches the room interior.
Daylight Redirecting Film
Daylight redirecting film (DRF) is a glazing film that contains microstructures which deflect incoming sunlight upward toward the ceiling rather than allowing it to travel in a straight line into the room. Applied to the upper portion of a south- or southeast-facing window, it redirects direct sunlight to the ceiling, from which it is diffusely reflected deeper into the space — a technique useful in cottages where south glazing admits high summer sun that would otherwise cause glare at eye level.
DRF is commercially available as a retrofit film applied to existing glazing. It is most effective when the ceiling has a high LRV, since the film simply redirects light — what happens to it after depends on the ceiling's reflectance. The U.S. Department of Energy documents this technology in its daylighting guidance.
Mirrors and Reflective Surfaces
A flat mirror positioned to reflect light from a window into a darker part of the room is among the most straightforward and reversible daylighting interventions. For maximum effect, the mirror should be placed on the wall opposite or perpendicular to the window — not adjacent to it. A mirror adjacent to a window simply reflects the window's view back outward; a mirror on a perpendicular wall intercepts the reflected light from the adjacent wall and projects it further in.
In small cottage bathrooms or hallways where window area is limited, a full-height mirror on one wall often makes the most meaningful contribution to perceived brightness for the least cost and effort.
Furniture Placement
Tall furniture placed between the window and the room interior blocks the path of reflected light. In rooms with limited daylight, keeping the space between the window and the centre of the room clear of tall storage allows the floor-level light to travel further. Lower furniture (seating height and below) does not significantly interrupt the ceiling-level light path.
Window treatments — blinds, curtains, shutters — that are closed during the day obviously block incoming light. In cottages with privacy screening needs, translucent white roller shades transmit diffuse light while blocking the direct view in both directions. Heavier blackout curtains or solid shutters are better suited to sleeping areas where full light blocking is the actual requirement.
Last reviewed: May 2026. References: U.S. Department of Energy daylighting guidance, Natural Resources Canada.