A dimming feature is really only required when you are lighting a larger space such as a room – it generally does not play a role in spot lighting. When it comes to spot lighting, it is more common to choose a lamp with the desired level of intensity.
While it is possible to dim LED lights, this requires that you use the correct combination of components, and it also depends on the length of the rail. Philips has stated that its 7W and 8W lamps are dimmable, but this is not the case with the 3.4W lamp. Since Philips regularly changes the specifications for dimming MasterLED lights, we recommend that you check the Philips Lighting website for further information: www.philips.com/masterledlamps.
It is easier to dim the lights if you use halogen bulbs, but you should bear in mind that these bulbs consume five times as much energy as LED bulbs, while the average service life of a halogen bulb is also 20 times shorter than that of an LED bulb.
To summarise: while the Combi Rail Pro Light is dimmable, we recommend that you choose not to dim spot lights but rather choose bulbs with the appropriate level of intensity.
We recommend that you use LED bulbs as this is less expensive because they consume less electricity and have a much longer average service life. In our experience, the MasterLED 7W meets the requirements of most applications.