ETC Source Four Assembly Manual page 18

Lens Markings
The lenses are color-coded for identification. Normal lenses have a single dot of color while
Enhanced Definition lenses have a combination of white dots and color dots. See
for lens color coding.
19°
26°
36°
50°
* Some pre-2006 fixtures have lenses with two color code dots. There is no difference between lenses with
one dot or two dots.
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Standard Lenses
Lens - Red Dot*
(one or two dots)
Lens - Black Dot*
(one or two dots)
Rear lens - Blue dot
Front lens - Orange dot
Lens - Yellow Dot*
(one or two dots)
Align lens dots toward this end
Enhanced Definition
Lenses
19° ED
Rear lens - 1 white dot & 1 blue dot
Front lens - 1 white dot & 1 red dot
26° ED
Rear lens - 1 white dot & 1 yellow dot
Front lens - 1 white dot & 2 red dots
36° ED
Rear lens - 1 white dot & 2 blue dots
Front lens - 1 white dot & 1 orange dot
50° ED
Rear lens - 1 white dot & 3 blue dots
Front lens - 1 white dot & 1 green dot
Source Four Assembly Guide
Figure 16
Figure 16