Fresnel

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Strand 6 " Fresnel	EC 6" Fresnel	Century 6" Fresnel	3" Fresnel (Inky)
BTR 1Kw	BTN 750w	BTL 500w	ETC 150w

Boston Light
Boston Harbor, Massachusetts

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Reflector

Spherical

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Fresnel Lens
Derived from Plano-Convex Lens


Side View

Front View

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Lens Advantages

Thinner Lens Means:
Less weight
Cheaper to make
Resists heat better
Soft diffused spot light

Shorter Focal Length Means:
Smaller light fixture

BTR	BTN	BTL	ETC

Spot/Flood Capability

Spot = Lamp/reflector moves away from lens
Flood = Lamp/reflector moves towards lens

Accessories

Barndoor	Top Hat
Gel Frame Holder	Fresnel Sizes Inches in Diameter 3", 6", 8", 12"

History of the Fresnel Lens

Lighthouses in America