Twistlock photocells are generally set around 2.5fc, and threaded mount types are 4.5fc. Turning off, however, is slightly different. Most photocells are set to trip around 1.5fc. You might simply have to replace your photocell with a new one. Not sure how they work and what the difference would but or how the tape benefits a photocell but just some things that may or may not help you. There is also an array of photoreflective lenses that you can buy and even some tape. Intermatic has since stopped making those and everything i have come across in the last 2 years has a built in delay (does not matter for what your tryin to do) to reduce bright headlights from triggering it. You could adjust the gap on the coil to slow the on time or make it more sensitive or not. At my work, we use a photo eye to trigger a PLC for another application, we used to use an intermatic one that had an adjustable coil. Grainger sells alot of industrial conduit or stem mount units and you can see all the specs on those (at least to get an idea on how much they vary). I'll let you google what a foot candle is. The specs you are looking for would be the "foot candles on" and "foot candles off" value.
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