Flash Bulbs
Many modern studio light units use both flashtubes and lamps to illuminate the subject. Traditionally the modeling light is lit only while the shutter is closed, allowing the photographer to predict where the light is focused. When the photographer presses the shutter, the modeling light goes out and the flash bulb illuminates, creating a brief and very powerful light source.
Both flashtubes and lamps come in a variety of configurations and brightnesses to provide the best results for specific studio lights and applications. Reliable and recognizable brands include Flashpoint, Profoto, Arri, and Elinchrom.
Understanding lamps
While strobes use lamps as secondary modeling lights for reference, constant lighting sources don’t use flash bulbs. In that case, the lamp is the primary light source. The term “lamp” can also be thought of as a light bulb, and describes any light that remains constantly lit. Other varieties of lamps include fluorescent, halogen, flood, LED, tungsten, and a few other product-specific lamps like projector lamps.
Lamp power is measured in watts, ranging from 8 to 24,000. To determine which lamp is compatible with your light fixture, look for any markings or descriptions on the lamp you need to replace, or check the specifications for the fixture itself. It’s important to purchase the correct type, wattage, and base type for your fixture.
Understanding flashtubes and flash bulbs
Flashtubes emit a very brief, very powerful flash of light. They are used in strobe light fixtures and come in a few different shapes and configurations. The flashtubes you use with a modeling lamp are shaped like a ring to surround the lamp bulb, while flashtubes that work in fixtures without modeling lamps are often shaped like a dome or cylinder.
Wattage varies from 150 to 6,000, but, like lamps, you’ll need to select a flashtube with a wattage that corresponds with the power of your lighting fixture. To find the appropriate flashtube for your studio strobes, check your fixture’s manual or product specifications. Different manufacturers have different connection shapes and technology, so buying the right flashtube is important.
Selecting a color temperature
Both flashtubes and lamps come in a variety of color temperatures. While you can change the color cast in post-production if you shoot in RAW, it helps to make sure all of your lights and flash bulbs have the same color temperature so the lighting has a consistent look.
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