Lead Resistance Power Loss

So far, the ISL lamp leads for all versions of the A3030 device have been 100 mm, stretched MDC-13867A stainless steel springs with resistance ≈30 Ω. The buck converter on the A3030 supplies 5.0 V to one end of the lamp leads, the LED forward voltage is ≈3.0 V, leaving 2.0 V across the leads. Of the power delivered by the buck converter, 40% is lost in the lead resistance. In the past, we have tried to increase the maximum optical power emitted by the tip of the ISL fiber. We found that a 15 mW fiber-tip power could produce circling behavior with 2-ms pulses at 10 Hz. If we were to use 100-mm un-stretched leads, their resistance would be ≈60 Ω and fiber tip power would be 7.5 mW. We could then flash the light for 4 ms instead of 2 ms and emit the same number of photons, thus producing the same ontogenetic effect. The energy we lose in the lead resistance will be the same. In the A3030E, we propose to either increase the lead length to reduce strain on the head fixture, or to keep the lead length the same and use an un-stretched lead to achieve the same reduction of strain.