Light Blockers

L-Shaped Light Blocking
Easy Installation
Cuttable & Customizable
Inside Mount Blackout Compatible
Up to 97% Darker

$49.99

Quantity

Canisteo Light Blockers for Blackout Shades

Light Blockers help cover the small gaps along the sides of your blackout shades where unwanted light can enter. Designed for use with blackout shades, these L-shaped side light blockers provide a simple way to reduce side light and create a darker, more comfortable room without replacing your existing shades.

They are a practical upgrade for bedrooms, nurseries, media rooms, and any space where side light, light gaps, and unwanted light affect sleep, privacy, or screen viewing.

Who Are Light Blockers For?

Who	Why
Homeowners with blackout shades	Reduce side light and make the room darker
Bedrooms and nurseries	Block unwanted light along shade edges for better sleep
Media rooms and home theaters	Reduce side light and glare on screens
Renters	Simple upgrade without replacing existing shades
Anyone with light gaps	Cover small side gaps where light enters

Why You’ll Love the Light Blockers

Side light blockers for blackout shades

L-shaped design covers small side gaps

Reduces unwanted light for a darker room

Works with your existing blackout shades

No need to replace your current shades

Simple, practical upgrade for bedrooms and media rooms

Helps create a darker, more comfortable sleep space

Compatible Shades: Inside-mounted blackout shades.
Mounting Methods: Screw fixation or nano adhesive backing.

Shipping

All orders enjoy free worldwide shipping via UPS, USPS, FedEx or DHL.
Order confirmation and tracking details will be sent to your email.
Estimated delivery: 3–19 business days. Delivery delays from courier or customs are out of our control.

Return & Refund

Standard accessories (remotes, ready parts):
Return requests are accepted within 30 days after delivery. Items must stay unused with original packaging.
Contact support@canisteoblinds.com for return authorization before sending back.
Damaged items: submit photo/video proof within 7 days of receipt. We cover return shipping for manufacturing or transit defects.
Customer change of mind: buyer pays return shipping. Refunds process in 5–10 business days after inspection.Custom window shades & custom cut parts:
Custom items cannot be returned for change of mind, wrong measurements or color selection.
Returns are only available for manufacturing defects or shipping damage within 30 days.
Prior return authorization is required for all returns.

Important

Unauthorized returned packages will be refused. Our 2-year limited warranty works separately.

Enjoy Free Shipping!

Light Blockers

$49.99

Specifications

SKU

CT-BLOCKER-LShape-Black/CT-BLOCKER-LShape-White

Size

37x37mm (Profile)

Shape

L-Shape

Color

Black / White

Material

Polystyrene

Blackout Rate

97%

FAQs

Not at all. It’s a simple peel-and-stick process, or you can use screws for a more permanent hold. No special tools are required. Just ensure your window frame is clean and dry before attaching the blockers for the best seal.

Yes. The durable material can be easily trimmed with a utility knife or scissors to match your exact window length. This allows you to customize the fit perfectly, ensuring zero light leaks.

Yes. The durable polystyrene material is easy to trim with a utility knife or scissors. You can customize the length to match your window perfectly, helping block side gaps for a darker room.

No. They are installed along the edges of the window frame, not on the shade itself. Your shade will still roll up and down smoothly. Just leave enough clearance for the fabric to move freely.

These light blockers are specifically optimized for inside-mount shades, where side light gaps are most common. For outside-mount installations, they might not provide the same sealing effect.

Yes, they are available in classic White and Black to seamlessly blend with your window frame or interior decor.