Adobe Illustrator

Light Bulb

Using Radial Gradient

1. I have drawn a light bulb which is not very realistic but it should be good enough for this lesson (figure 1). Let's light it.

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Fig. 1 A light bulb

2. Draw a circle (L, Shift) and apply gradient fill with the parameters as shown in figure 2. The circle border should be black.

Fig. 2 Gradient parameters

To add a new color you may just click right under the gradient stripe on the GRADIENT panel. A new Color Stop slider will appear. Double click it to show the color palette.

3. Set transparency mode Screen on the TRANSPARENCY panel (figure 3) and put the circle on top of the bulb.

Fig. 3 Setting transparency mode

It is ready!