I'm looking into the through beams. In very heavy snowfalls there will always be a risk of blocking the beam, but I imagine that depends on how tight or wide the beam is- that is, the size of the object required in order to trigger an impulse. I imagine some brands/models of beams will trigger with say a 2cm diameter object blocking the beam, whereas others might require say a 4cm diameter object?
"The ALGE cell with the glass lens projects quite a tight beam."
By a tight beam does that mean they have a narrower range for aligning, and are more susceptible to false finishes from vibration or snowflakes?
Do the older rectangular silver Alge photocells (from 15+ years ago) have a tigher or a wider beam?
Are there other brands that have wider beams, which are more forgiving?
"Use photocells with batteries, even when powered from the timer. "
Why is that?
Thanks for the info, it's interesting to understand the technology better.
+M