A so17xa reflector is secured to the E-screw module. An additional prototype reflector was
modified with the rear portion removed to allow it to nest over the so17xa and essentially
have no effect on the beam when the reflector system is "collapsed".
The components below:
The secondary reflector is secured in the front, outer section of the head. As this section is
slid forward over the rear, inner section of the head which contains the LED module
with attached primary reflector, the "spill" portion of the beam is caught and re directed by
the secondary reflector into a tighter beam angle than that of the primary. A stepped bore
in the outer head as well as shoulder on the inner head keep the two from sliding completely
In the beam shot below, you can see that in the "zoom" to spot mode, the additional light
that had been spill light in a wide direct flood has been collimated into a tighter spot beam
within the primary spot beam. The lux readings were taken at approximately 39".
It takes about 5/16" longitudinal extension to go from primary flood alone to focused
secondary. Extending the secondary beyond focus causes its reflected beam to diverge and
join the reflected spot of the primary. The beam angle of the spill portion is reduced and
there appears to be a higher concentration of light within it as well.
Secondary extended to focus:
A second head was made and anodized. To keep water and dirt out of this head, an O-ring
was added as a bore seal in the rear end of the outer head piece. A radiused groove was
added in the bottom of one of the fin grooves and relief was milled out as well as a small
"breather hole" drilled in the bottom of the groove. In the pic below, the white spot in the
groove is the hole and you can make out the O-ring in the head. An external O-ring is
added into the groove to cover the breather hole. It can be pulled back to allow air
passage. This design would need considerable more effort and refinement to be viable but
this proto type should at least be up to exposure to rain and dirt.
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