A recent article examined light patterns from common lighting bulbs and took apart a Philips (www." philips.com) LED bulb to understand how its use of a secondary phosphor affects its light pattern (Reference 1). This article continues that discussion of the Philips 12.5WLED bulb, which relies on a secondary phosphor to spread its light in an almost-360° pattern (Figure 1). Figure 2 shows the top view of the bulb looking down into the wiring and connectors that take the power to the three LED boards.
展开▼
