The General Brand ECA 250 Watt/120 Volt standard flood light lamp has an E26 Edison screw base. It burns at 3200° Kelvin. Brand may vary due to availability.
To specify G-E brand, order: GEECA
For a 500 watt version of this bulb, click here.
For a 4800°K (daylight) version of this bulb, click here.
Umbrellas soften, broaden, and diminish the light output of any tungsten or flash light source. Umbrellas with a white interior will soften and weaken light more than an umbrella with a silver lining.
Choosing umbrella size is determined by the size of the subject, and the strength of the light supply being used. Choosing an umbrella surface is as subjective as choosing a paint and brush.