How big a hole should be drilled when installing fairground light bulbs？

The size of the hole required for installing the fairground light bulbs should be determined according to its specifications and installation method, as follows:

E27 fairground light bulbs

Screw diameter: 27mm
Applicable scenarios: ordinary lamps in home and commercial lighting
Installation hole diameter: use a hole with a diameter slightly larger than 27mm to ensure that the lamp holder can be firmly embedded. If expansion bolts are used for fixing, the drill bit (usually larger than 6mm) needs to be selected according to the bolt specifications.

E14 fairground bulbs

Screw diameter: 14mm
Applicable scenarios: small table lamps, chandeliers, decorative lamps
Installation hole diameter: use a hole with a diameter slightly larger than 14mm. If the lamp is fixed on a metal structure, it is necessary to ensure that the inner diameter of the steel pipe is greater than 10mm and the wall thickness is greater than 1.5mm.

E10 fairground light bulb

Screw diameter: maximum 9.4mm
Applicable scenarios: special purposes such as miniature flashlights and decorative small lights
Installation hole diameter: use a hole with a diameter slightly larger than 9.4mm, usually with a miniature lamp holder or a special fixing device.

Notes: Before drilling, confirm the lamp installation instructions to ensure that the hole diameter matches the lamp holder specifications.
Outdoor lamps need to reserve space for waterproof joint installation to ensure sealing.
Heavy-load lamps (weight > 3kg) need to be pre-buried with hooks or fixed with expansion bolts, and the drill bit diameter must be greater than 6mm.