#83 -- This design really captured our attention. It projects an industrial yet modern look. However, we see a few problems. The mark draws attention first to the letter "I". Without seeing the name a viewer upon seeing the mark for the first time might think that the first name of our company starts with the letter "I" and the second name starts with "S". We would like to see related ideas that signified "SI" as the company initials rather than "IS".
One specific variation would we like to see is the close the gap between the "I" and the dot on the outer ring.
Additionally, the spotlight effect is interesting, but the spotlight angle needs to remain consistent across the entire mark. #83 looks like the spotlight effect hits the "i" and "s" at different angles.