Philips HPI Plus 400W 645 BU E40 MASTER

By purchasing the Full box quantity, your products will come as packaged by the manufacturer.

The cap/base of a bulb is the part that connects it to the socket in the fixture. E27 (Edison screw) and E24 (small Edison screw) caps/bases are among the most popular, although this depends on your location. GU10 is generally the most common cap/base for spotlights. Check which cap/base you need carefully as many other types are also available.

Light colour is also known as colour temperature and is expressed in Kelvin (K). You can choose from:

• Extra warm white (1700K - 2700K). Atmospheric light. For places with a relaxing character.
• Warm white (>2800K). Neutral and soft light. For common areas such as halls, corridors, foyers.
• Cool white (>3400K). Fresh and natural light. Good for focus/concentration in schools and offices
• Daylight white (>5000K). Equals natural daylight. Suitable for situations where a lot of light is needed.

The colour rendering index (CRI) indicates how accurately colours are represented under a beam of light. The index goes from 1 to 99, with a CRI of 1 being the poorest and a CRI of 99 being the best possible. Be careful not to confuse colour rendering with colour temperature (K).

Lumen (lm) is the term used to describe the total amount of visible light emitted by a light source. The higher the number of lumens, the brighter it is.