Which Color Polycarbonate is Best? Clear vs Smoky vs Bronze
The right colour depends entirely on your project. This guide breaks down the light transmission, heat reduction, and ideal applications for each option available from Plastics Canada.
January 2026 • 6 min read
The Short Answer
There is no single "best" colour — the right choice depends on your application:
- Greenhouse or skylight? Use clear — maximum light transmission.
- Patio cover or pergola? Use smoky or bronze — reduced glare and heat.
- Privacy screen or south-facing roof? Use bronze — strongest heat reduction and privacy.
Colour Comparison at a Glance
| Colour | Light Transmission | Heat Reduction | Privacy | Best For |
|---|---|---|---|---|
| Clear | ~88% | Low | None | Greenhouses, skylights |
| Smoky | ~40–50% | Moderate | Partial | Patios, pergolas, carports |
| Bronze | ~25–35% | High | Good | South-facing covers, privacy |
Clear Polycarbonate
Clear polycarbonate is the most popular choice. It transmits the most light of any option, making it essential for greenhouses, cold frames, and any application where plants or natural light are priorities. It looks like glass but is virtually unbreakable.
Best For:
- Greenhouses
- Skylights
- Window replacements
- Indoor dividers
Not Ideal For:
- Hot sunny patios
- South-facing roofs in summer
- Privacy screens
Smoky (Grey) Polycarbonate
Smoky polycarbonate has a neutral grey tint that gives a modern, contemporary look. It reduces glare and provides moderate heat reduction — a good all-round choice for covered outdoor areas in Canadian summers where you want brightness without direct glare.
Best For:
- Patio covers
- Pergolas
- Covered walkways
- Carports
Not Ideal For:
- Greenhouses
- Areas needing maximum natural light
Bronze (Tinted) Polycarbonate
Bronze polycarbonate blocks the most solar heat of the three options, making it ideal for south-facing patio covers and pergolas in sunny Canadian summers. The warm amber tint creates a pleasant filtered light similar to late-afternoon sun.
Best For:
- Pergolas
- Patio roofing
- South-facing covers
- Privacy screens
Not Ideal For:
- Greenhouses
- Skylights
- Any plant-growing application
What About UV Protection?
A common question is whether tinted polycarbonate blocks more UV than clear. The answer is: colour has no significant effect on UV blocking. All three colours — clear, smoky, and bronze — come with the same UV co-extrusion coating that helps prevent yellowing and protects against UV-B radiation. If UV protection is a priority, all options are equal.
Canadian Climate Considerations
Canada's climate varies enormously, and colour choice can make a practical difference:
- Southern Ontario & BC summers: Bronze or smoky panels reduce solar heat gain on patio covers, making outdoor spaces more comfortable in July and August.
- Prairie winters: Clear panels on a greenhouse or sunroom maximise the limited winter sunlight and reduce heating costs.
- Year-round use: Smoky is often the best compromise — enough light in winter, enough shade in summer.
Can You Mix Colours?
Yes — it is perfectly possible to mix colours on a single structure. Some homeowners use clear panels on north-facing roof sections (to maximise winter light) and bronze on south-facing sections (to reduce summer heat). This is a practical and cost-effective approach for pergolas and patio covers.
The Bottom Line
For most Canadian homeowners building patio covers or pergolas, smoky or bronze is the practical choice for comfort. For greenhouses, window replacements, or any application where plant growth or maximum natural light matters, clear is the only option. All three are available from Plastics Canada, custom cut to your exact size.
Frequently Asked Questions
What is the difference between clear and bronze polycarbonate?
Clear polycarbonate transmits approximately 88% of visible light, making it ideal for greenhouses and skylights where maximum light is needed. Bronze polycarbonate transmits around 25–35% of light and reduces solar heat gain significantly, making it better suited for patio covers and pergolas where shade and glare reduction matter.
Is smoky or bronze polycarbonate better for a patio cover?
Both work well for patio covers. Bronze offers stronger heat reduction and a warmer aesthetic. Smoky (grey tint) provides a more neutral, modern look with moderate light reduction. The choice comes down to your aesthetic preference and how much shade you need.
Can plants grow under tinted polycarbonate?
Most plants can grow under lightly tinted polycarbonate, but for optimal plant growth in a greenhouse, clear polycarbonate is recommended to maximise light transmission. Smoky or bronze panels can be used in partial-shade greenhouses or to prevent overheating in summer.
Which colour polycarbonate blocks the most UV?
All our polycarbonate sheets — clear, smoky, and bronze — include a UV co-extrusion coating that blocks UV-B radiation. The colour (tint) affects visible light transmission and solar heat gain, not UV blocking. UV protection is a function of the coating, not the colour.