PHOTOGRAPHIC LIGHT SOURCES 281 



Table IV. — Characteristics of Lamps for Photographic Purposes 



Type 



Power 

 rating, 

 watts 



Oper- 

 ating 

 volt- 

 age 



Bulb 

 size 



Type of bulb 



Life, 

 hr. 



For General Lighting — In or out of Studio 



Photoflash No. 10 

 Photoflash No. 20 

 Photoflash No. 75 

 Photoflood No. 1 . 

 Photoflood No. 2 . 

 Photoflood No. 4 . 

 Movieflood 



Clear 



Clear 



Clear 



Inside frosted 



Inside frosted 



Inside frosted 



Clear 



Med. screw 

 Med. screw 

 Med. screw 

 Med. screw 

 Med. screw 

 Mogul screw 

 Mogul screw 



8,650 

 17,000 

 33,500 

 65 , 000 



One flash 



2 



6 



10 



15 



For General Lighting in Studio 



Clear 



Photo blue, in- 

 side frosted 



Clear 



Photo blue, in- 

 side frosted 



Clear 



Photo blue, in- 

 side frosted 



Med. screw 

 Mogul screw 

 Mogul screw 



Mogul screw 

 Mogul screw 

 Mogul screw 

 Mogul screw 



Mogul screw 

 Mogul screw 

 Mogul screw 



Mogul bipost 

 Mogul bipost 



3200 

 3200 



3200 



3200 

 3200 



For Spotlights 



.400 

 400 



110-120 

 110-120 



G-30 

 G-30 



Clear 

 Photo blue 



Med. screw or 

 Med. prefocus 

 Med. screw 



Enlarging Lamps 



Inside frosted, 

 outside coated 

 white 



Clear 



Clear or frosted 



Clear 



Med. screw 

 Med. screw 

 Med. screw 



Med. screw 

 Med. skirted 

 Mogul 



Note: The letters indicate the shape of the bulb as follows: A — pear shape with .short glass stem. 

 G — globular (spherical). PS — pear-shaped. The numbers indicate the maximum diameter in eighths 

 of an inch. Thus the number 40 indicates a bulb whose diameter is *% or 5 in. maximum. As an 

 example, a G-48 bulb would be globular or spherical in shape, and would have a maximum diameter 

 of 6 in. 



