The size of the wire interface reserved for room roof light (bedroom ceiling lighting) depends on two core factors: the fixture’s power (wattage) and installation type (surface-mounted vs. recessed). Generally, low-power models (≤20W, e.g., round led ceiling light) require a 2.5mm² copper wire interface, while medium-power models (20W–40W, e.g., Bean Ceiling Lights) need a 4mm² copper wire interface—this ensures safe current transmission and avoids overheating. Additionally, a standard 86-type junction box (depth ≥50mm, width 86mm×86mm) is required to house wire connections, compatible with most room ceiling light and roof lights for ceiling. Premium fixtures like IMIGY’s Halo Ceiling Lights (smart, 30W) also support universal wire interfaces, eliminating the need for custom modifications, and pair seamlessly with other bedroom lighting (round ceiling light, round led ceiling light) for unified wiring. Below is a breakdown of interface specifications, our products’ advantages, and practical tips.

1. Wire Interface Size by Power & Installation Type

a. Low-Power Room Roof Light (≤20W)

Wire specification: 2.5mm² single-core copper wire (rated current 16A, sufficient for 20W LED lights). Suitable for small fixtures like round led ceiling light (10W–15W) or small roof lights for ceiling (12W).

Junction box: 86-type shallow box (depth 50mm–60mm) — fits in thin ceilings (≤10cm thickness) without extra cavity excavation. Ideal for post-renovation upgrades.

b. Medium-Power Room Roof Light (20W–40W)

Wire specification: 4mm² single-core copper wire (rated current 25A, safe for 20W–40W fixtures like Bean Ceiling Lights (24W) or Halo Ceiling Lights (30W)). Prevents wire overheating even when the light is used for 8+ hours daily.

Junction box: 86-type deep box (depth ≥70mm) — accommodates thicker wires and smart modules (e.g., Halo’s built-in Wi-Fi driver), avoiding wire cramming (a cause of short circuits).

2. IMIGY Products’ Wire Interface Advantages & Synergy

a. Bean Ceiling Lights (Medium-Power, Surface-Mounted)

Universal Interface Compatibility: Bean (24W) supports both 2.5mm² and 4mm² copper wires—if you reserved a 2.5mm² interface (for old low-power lights), it can still be used (no need to rewire). The light’s terminal block has clear “L/N/E” markings, simplifying connection (no polarity confusion).

Pairing with Round Ceiling Light: Use Bean as the main room ceiling light (4mm² wire) and pair with 2 round ceiling light (15W each, 2.5mm² wire) in corners. Both connect to the same 86-type junction box (via branch wires), reducing ceiling hole count and installation time.

b. Halo Ceiling Lights (Smart, Medium-Power)

Smart Module Compatibility: Halo (30W) has a built-in smart driver that fits 86-type deep junction boxes (depth 70mm). The 4mm² wire interface ensures stable power supply for smart functions (APP control, voice control), unlike cheap smart lights that require extra wire adapters.

Synergy with Roof Lights for Ceiling: Link Halo (main light, 4mm² wire) with roof lights for ceiling (18W, 2.5mm² wire) via a shared junction box. The box’s internal terminals separate main and auxiliary light wires, avoiding interference (critical for Halo’s anti-interference smart signal).

3. Practical Tips for Reserving Wire Interfaces

a. Pre-Installation Preparation

Confirm wire material: Use pure copper wire (not aluminum wire) — aluminum has poor conductivity and is prone to oxidation, leading to contact failure. IMIGY recommends national standard copper wires (e.g., BVR single-core flexible wire).

Junction box placement: Install the box directly above the center of the bed (for room ceiling light) or 30cm away from walls (for round ceiling light) — ensures the light aligns with bedroom layout, avoiding off-center installation.

b. Avoid Common Mistakes

Don’t use undersized wires: A 2.5mm² wire for 30W Halo Ceiling Lights will overheat (current exceeds 16A) — always match wire size to power.

Don’t ignore junction box depth: A 50mm shallow box for Halo (with smart module) will cram wires, risking short circuits — use ≥70mm deep boxes for medium-power smart lights.

Don’t mix wire types: Never connect copper wire and aluminum wire in the same junction box — different expansion coefficients cause loose connections over time.

The wire interface for room roof light installation depends on power: 2.5mm² for ≤20W, 4mm² for 20W–40W, plus a standard 86-type junction box. IMIGY’s Bean Ceiling Lights (universal wire support) and Halo Ceiling Lights (smart module compatibility) eliminate wiring troubles, adapting to most pre-reserved interfaces and pairing seamlessly with round ceiling light, round led ceiling light, and roof lights for ceiling. Whether you’re renovating a new bedroom or upgrading an old one, our products ensure safe, simplified wiring. Contact us to get personalized recommendations — we’ll help you confirm wire size and junction box type based on your chosen room ceiling light and bedroom ceiling thickness.