||A primary objective of this lamp was to simulate the light distribution and illuminated appearance of a pearl finish incandescent lamp. Earlier LED retofits had a highly asymmetric light distribution, with most light being emitted through the bulb crown and very little in the direction towards the cap. Additionally, the efficacy of this LED retrofit has been raised above comparable products of its time by a particularly elegant approach employing a remote phosphor.
The core light source consists of five Luxeon Rebel LEDs in royal blue colour, mounted on a flat PCB. These shine into a small hollow plastic hemisphere, the polymer itself being loaded with YAG type fluorescent phosphor (hence the yellow appearance when off). The fluorescent inner bulb converts a portion of the blue light from the LEDs into other wavelengths for a net white light. The whole assembly is disposed within a glass bulb frosted on its inner surface, and when lighted the appearance is similar to a Pearl finish incandescent lamp.
This was also one of the first lamps to step away from the use of aluminium for its heat sink. The body is moulded in a polyamide material loaded with graphite to increase its thermal conductivity to sufficiently high levels, hence the dark grey colouration.
The 400 lumen output of this lamp was the highest of any warm white A60 LED retrofit at the time of its launch, but that is only equivalent to a theoretical 35W incandescent lamp. Within a few months of its launch it was superseded by a slightly more powerful 8W model, which was first to achieve the 470lm target required to claim equivalency to 40W incandescent.