I had a spark I used on a HoggFather I had and I bought one of each color light to find out which worked best. Sold it 2 weeks later because the lighted dot was not visible in the sunlight with any color. The sunlight washed out all the light making the whole idea of the spark scope non functioning. It works great indoors, but outside the dot disapeared. So in my opinion from my experience with it id save the money or spend it on a scope with an up pin or use a sticker. I find it odd that it made it through testing and was released with such a major flaw in the design.
I own both a Spark Pro and a Spark Hunter. I love my Spark Pro. As for the light, yes it isn't visible in sunlight, but honestly, I never turn the light on, inside or out, I still can see my dot.
Now, I have a 2x cross hair lens on my Hunter model. Well, I didn't care for it hunting. I had to mess with a scope cover to make sure I didn't damage the lens walking through the woods, and then had to deal with rain or snow on the lens. I got it for a pretty good deal, so I've got the lens if I ever want to use just a 2x for target. I ended up going back to an up pin without a lens for hunting, but still believe strongly in my Spark Pro.
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