If light leaks through the side gaps beside your window shades, two-piece light blockers can help darken the room without replacing the shades. The ZSTARR 58-inch PVC strips are the closest match in this selection: choose black or white to suit your window area. The other listed items are a replacement window and decorative projectors, not solutions for blocking shade-edge light, so check the comparison before choosing.
| Product | Best suited for | Relevance to light blocking |
|---|---|---|
| ZSTARR Black 2-Piece Light Blockers | Dark window frames or trim | Designed to reduce side light gaps |
| ZSTARR White 2-Piece Light Blockers | Light-colored window frames or trim | Designed to reduce side light gaps |
| NOTASA Single-Hung Window | Window replacement projects | Not a shade-gap blocker |
| Halloween Window Car Projector | Seasonal projection decor | Creates light; does not block it |
| Halloween and Christmas Car Projector | Holiday projection decor | Creates light; does not block it |
ZSTARR Black Two-Piece Light Blockers
Best for: People with blackout shades or blinds who want to reduce light entering through the side gaps. The set includes two black L-shaped PVC strips, each 58 inches long, with a peel-and-stick adhesive backing. The strips can be trimmed with household scissors, and the listing says they may be combined for coverage.
Choose this version if black suits the window frame or surrounding trim. It was selected because its stated purpose directly matches reducing side light leakage around shades. Install the blockers close to the shade for better coverage, while keeping the shade’s movement in mind.
Limitation: These strips are intended to reduce side gaps, not replace blackout shades or block light coming through the shade itself. Check your window measurements and installation space before applying the adhesive.
ZSTARR White Two-Piece Light Blockers
Best for: Buyers looking for a light-colored alternative to the black ZSTARR strips. This two-piece set uses L-shaped PVC blockers measuring 58 inches long. The product is designed to reduce light leaking around the sides of blinds and shades, and its adhesive-backed installation does not require tools.
Choose white if it better suits your window frame or room finish. Like the black version, the strips can be trimmed for a custom fit. This is a relevant option for improving room darkening when the main issue is light passing through the shade’s side gaps.
Limitation: The listing does not provide the same installation details as the black version, so confirm the exact dimensions and fit for your window before purchase. It is not a substitute for a blackout covering.
NOTASA Single-Hung Replacement Window
Best for: A buyer researching a window replacement rather than a small accessory for a sliding shade. The listed 24-by-36-inch vinyl window has double-pane insulated tempered glass, a rear drainage outlet, and a sash that tilts inward for cleaning.
It was included as a related window product, but it does not serve the same purpose as the ZSTARR light blockers. Consider it only if you are evaluating a replacement window and its listed dimensions suit your project.
Limitation: The product information does not establish that this is a slider window or that it will fit a particular opening. Verify the window type, measurements, and installation requirements before choosing it.
Halloween Window Car Projector
Best for: Seasonal decor rather than reducing daylight. This compact USB projector offers a horror-pattern projection mode and a soft warm night-light mode. It includes 12 interchangeable projection discs and can display patterns on car windows, walls, ceilings, and other listed surfaces.
It was selected because its name refers to window use, but its function is decorative projection—not shade-gap sealing. Choose it for Halloween scenes or a bedside light if those are your goals.
Limitation: It does not block light entering through a window. The listed features do not specify projection brightness or operating controls beyond switching modes and changing discs.
Holiday Car Projector With 12 Slides
Best for: People who want rotating Halloween or Christmas projections for a vehicle or indoor holiday display. The projector connects to a USB power source and includes interchangeable seasonal slides. Its listed features describe projection onto walls, ceilings, or vehicle bodies.
This is another decor item, not a window light-control product. Choose it for festive effects, not for improving room darkening or sealing a shade’s side gaps.
Limitation: The product details do not describe a light-blocking function, and the USB power requirement means a suitable power source is needed.
Buying Guide: How To Choose Light Blockers For A Slider Window
Are you trying to stop light at the shade edges?
Start by identifying where the light enters. If it comes through narrow gaps beside a blind or blackout shade, L-shaped side blockers are the relevant product type. If light passes through the shade fabric, a side strip may not solve the problem; consider whether the shade itself provides enough coverage.
Which color and size should you choose?
Compare the strip color with your window frame and trim. The ZSTARR options listed here are 58 inches long and sold as two-piece sets. Measure the areas you want to cover and check whether the strips can be positioned without interfering with the shade. The black version’s listing says the material can be trimmed with household scissors.
Will adhesive installation work for your window?
The black ZSTARR listing describes peel-and-stick installation on the inside window frame and recommends placing the strips close to the shade. Check that the intended surface is suitable for adhesive and that the shade can still raise and lower. Do not assume the blockers fit every window or shade configuration.
Do light blockers replace blackout shades?
No. The ZSTARR products are described as supplements that reduce side light leakage. They are not presented as replacements for blackout shades, and they cannot address every source of light entering a room.
Frequently Asked Questions
What are two-piece window light blockers used for?
They are placed along the sides of blinds or shades to reduce light that escapes through side gaps.
Can these blockers make a room completely dark?
The product information promises reduced side leakage, not total darkness. Light may still enter through the shade or other uncovered areas.
Can I trim the ZSTARR strips?
The black version’s listing says the strips can be trimmed with standard household scissors. Check the instructions for the specific version you select.
Are the Halloween projectors light blockers?
No. They project decorative light patterns and are not designed to reduce window light leakage.
Is the NOTASA window a slider window?
The listing describes it as a single-hung window. Confirm the window type and dimensions before considering it for a replacement project.