EXTERIOR LIGHTING 93 



with the USN diving lights occurred until the 14th day when all lights were made up and stowed 

 in the cage on the starboard side. 



2. a. An underwater harness had been made up for disconnecting the USN lights outside 

 the habitat, but no record had been kept so no one knew which light was connected to which 

 underwater connection. We had to turn off all lights when removing or replacing or repairing 

 bulbs. 



b. The USN 1000-watt light lasted on the average of 36 hours. It is known that turning 

 on and off both types of lights shortens the life of the bulb considerably. 



3. Team 3 used three mercury lights during its stay, burning out three bulbs each and one 

 power pack. These lights were very good, but usually they burned out when they were turned 

 off and then on, even in the water. 



4. The power pack which burned out in the lab was disconnected when the odor of something 

 burning was detected. A short was subsequently discovered in the underwater connection plug. 



5. The Burns and Sawyer photo lights were connected with the switch topside, but this was 



a poor arrangement, since two separate divers received electrical shocks when recovering them 

 to be sent topside for repair after burn-out. There was a slight crack in the lens of each one. 

 These lights were the quartz type. 



6. General Comments. 



a. USN Diving Lights: 



(1) The mix-up in the lights occurred as a result of making them up prior to lower- 

 ing and not tagging in several places. Recommend: Sealab divers install and connect own lights 

 and keep a log of same. 



(2) Get a longer-life bulb. 



(3) Recommend: An easy underwater bulb-replacement procedure. 



(4) Recommend: Mercury-vapor type lights. 



b. Mercury-vapor type: 



(1) Need an easier underwater connector. The one used required two men to dis- 

 connect and had two-prong poles, one just a little smaller than the other. This required bring- 

 ing inside the lab to connect up. 



c. Burns and Sawyer Diving Lights: 



(1) Install switch inside the lab. 



(2) Eliminate the electrical hazard of cracked lens. 



