I wanted to share a real cheap option for chronograph light. I purchased some LED lights off of Amazon for around $5.00 and soldered a power supply from a laptop. I matched up the power output of laptop power supply with the power requirements of LED lights. Soldered 2 wires and then a little heat shrink. I can turn on the chrono lights and then turn room lights on/off with no change in chrono lights. They work amazingly well. I recommend this over buying expensive chrono lights.