Light Exposure
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 Vintage Sekonic Auto Lumi 86 Light Exposure Meter Made in Japan  US $8.00
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 VIVITAR Light Exposure Meter Model 30 US $7.00
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 Sekonic L 328f Flash and Light Meter NEW US $310.97
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 Sekonic RT 32 Digital Radio Transmitter Module NEW US $85.97
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 Shepherd Polaris SFD110 Flat Diffuser Attachment for Polaris Meter NEW US $23.97
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 Dejur Amsco Light Exposure Meter US $3.99
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 3 STUDIO FLASH STROBE BACKDROP 600 W S SOFTBOX BACKDROP STANDS KIT US $389.00
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 3 STUDIO FLASH STROBE WIRELESS SOFTBOX LIGHT KIT 600W S US $289.00
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 3 STUDIO FLASH STROBE BACKDROP 900 W S SOFTBOX BACKDROP US $499.00
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 3 STUDIO STROBE FLASH LIGHT SOFTBOX WIRELESS 600W S US $319.00
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 GE Exposure Meter Type PR 1 for Film or Plates Serial M16261 Orig Case Used US $49.99
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 Sekonic Studio Deluxe Exposure Meter US $30.00
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 Polaris Light Meter US $75.00
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 Sekonic L 508 Zoom Master Flash Metering Mint Condition US $425.00
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 Yongnuo RF 603 24GHz Radio Wireless Remote Flash Trigger RF603 C3 for CANON US $31.99
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 Sekonic Light Meter Panel Incident Reflected with Case Adapter USED V083 US $7.99
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 Weston Master II model 735 Universal Exposure Meter US $4.99
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 SPECTRA CINE PROFESSIONAL IV A EXPOSURE LIGHT METER IN CASE BOX 3 85038 US $64.00
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 EXCELLENT Minolta Spotmeter M Digital Spot Meter With Instructions Case US $59.00
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 Yongnuo RF 603 24GHz Radio Wireless Remote Flash Trigger RF603 N1 for Nikon US $31.99
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 43 Inch 5 in 1 Light Multi Collapsible Photo Disc Reflector By Square Perfect US $21.95
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 Weston Master Universal Exposure light meter vintage excellent condition US $14.99
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 Vintage Gramercy 4 Bulb Photograph Studio Lighting Unit Tripod Mount US $4.99
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 3 Studio Flash Strobe 2 Softbox 3 Backdrop Wireless US $299.00
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 VINTAGE ZEISS IKON IKOPHOTOT T FUNCTIONAL LIGHT METER US $75.00
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 Minolta Flash and Ambient Light Meter III with Original Owners Manual and Pouch US $29.00
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 USED NEW SEKONIC L 358 LIGHT METER US $250.00 |
 Sekonic Studio Deluxe L 398 US $18.99
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 DIGITAL ON CAMERA FLASH WILL CROCKETT US $8.00
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 SEKONIC DIGILITE DIGI LITE F MODEL L 328 CAMERA LIGHT METER W DOME CASE US $53.00
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 GOSSEN LUNASIX CAMERA EXPOSURE LIGHT METER W CASE WORKING US $35.00
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 Vivitar Light Exposure Meter Shoe Mount with Case and Manual Very Clean 24 CdS US $7.99
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 VINTAGE GENERAL ELECTRIC LIGHT EXPOSURE METER MADE IN USA US $9.99
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 180W 180WS Studio Strobe Photo Flash Light LIGHTING NEW US $39.73
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 SEKONIC L 758 DR Light Meter NEW w Warranty Included US $629.99
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 Yongnuo YN565EX TTL Flash for Canon 5D II 7D 60D F359 US $151.00
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 gossendigiflash exposure meter and flashmeter US $85.00
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 VINTAGE WESTON ELECTRONICS CINE EXPOSURE METER MODEL 720 w CUSTOM LEATHER CASE US $9.99
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 SEKONIC DUALMASTER L 558r light meter US $500.00
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 540W Pro Strobe Studio Flash Light Lighting Photography Kit US $228.37
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Canon EOS Rebel T3 12.2 MP CMOS Digital SLR with 18-55mm IS II Lens and EOS HD Movie Mode (Black) List Price: $549.00 Sale Price: $499.00 Used From: $399.00  |
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The Canon 5157B002 includes the EOS Rebel T3 Digital SLR Camera and the EF-S 18-55mm f/3.5-5.6 IS type II Lens. This camera and lens is perfect for photographers ready to make the move to digital SLR photography... |
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NEEWER® Macro Ring LED Light - Works with Canon/Sony/Nikon/Sigma lenses List Price: $129.99 Sale Price: $29.52 Used From: $30.00 |
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This LED Macro Ring Light is specifically designed for close shots. It will constantly emit light and provide permanent lighting for subjects. With the LED lamp mode controller, you can adjust the three modes: all light, half left light, and half right light; With the power mode controller, you can choose two different power input modes to offers you continuous light: 2 AA batteries that is convenient for outdoor shooting or AC adapter input... |
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Sekonic L-358 Flash Master Light Meter List Price: $554.00 Sale Price: $308.50 Used From: $259.00 |
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Since its introduction, Sekonic's L-358 Flash Master has become the best-selling digital flash meter in its class. Weather-sealed against the nastiest of working conditions, the L-358 delivers dead-nuts accurate flash and ambient light reading in both incident and reflected modes... |
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Mastech Light Meter LX1010BS with lcd display ,100,000 Lux Luxmeter Sale Price: $13.39 |
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3 1/2 digits 18mm LCDRange: 1~100,000LuxAccuracy: ≤10,000Lux, ±(4%rdg+10digit)>10,000Lux, ±(5%rdg+10digit)Resolution: 1LuxRepeatability: ± 2%Temperature Characteristic: ± 0.1%/°CSampling Time: 0... |
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Polaris SPD100 Digital Exposure Meter List Price: $309.95 Sale Price: $168.00 Used From: $159.99 |
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Polaris SPD100 is an easy to use flash and ambient light meter. Take accurate meter readings accurate to 1/10th of an F-Stop and get good exposures every time. One of the best values in exposure meters on the market. |
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Canon EOS Rebel T3i 18 MP CMOS APS-C Sensor DIGIC 4 Image Processor Full-HD Movie Mode Digital SLR Camera with 3.0-Inch Clear View Vari-Angle LCD (Body Only) List Price: $699.99 Sale Price: Too low to display Used From: $559.99 |
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Canon EOS Rebel T3i 18 MP CMOS Digital SLR Camera and DIGIC 4 Imaging. Comes with a battery and charger. The USB cable and an AVI accessories are included. |
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NEEWER® 48 LED Ring Light for Macro Canon Nikon Sigma Tamron Lens Sale Price: $30.01 |
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This LED Macro Ring Light is specifically designed for close shots. It will constantly emit light and provide permanent lighting for subjects. With the LED lamp mode controller, you can adjust the three modes: all light, half left light, and half right light; With the power mode controller, you can choose two different power input modes to offers you continuous light: 2 AA batteries that is convenient for outdoor shooting or AC adapter input... |
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Mastech Digital Illuminance/Light Meter LX1330B , 0 - 200,000 Lux Luxmeter List Price: $79.95 Sale Price: Too low to display |
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The LX1330B can measure from 0 up to 200,000 lux, you can switch the units between lux and footcandle by simply pressing a button. It's powered by a 9V battery, which last for 200 hours or even longer... |
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Canon EOS 60D 18 MP CMOS Digital SLR Camera with 3.0-Inch LCD and 18-135mm f/3.5-5.6 IS UD Standard Zoom Lens List Price: $1,299.00 Sale Price: Too low to display Used From: $954.99 |
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An EOS with Perspective. With the new EOS 60D DSLR, Canon gives the photo enthusiast a powerful tool fostering creativity, with better image quality, more advanced features and automatic and in-camera technologies for ease-of-use... |
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Nikon D7000 16.2MP DX-Format CMOS Digital SLR with 18-105mm f/3.5-5.6 AF-S DX VR ED Nikkor Lens List Price: $1,499.95 Sale Price: $1,496.95 Used From: $1,248.99 |
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Meet the new Nikon D7000, a camera ready to go wherever your photography or cinematography takes you. Experience stunning images with sharp resolution and smooth tonal gradation, thanks to the 16-megapixel DX-format CMOS image sensor and a powerful EXPEED 2 image processing engine... |
How To Use Lights To Help Your Greenhouse Run More Profitably
Green-leaved plants need light to live. Light acting upon leaf and stem cells helps change carbon dioxide taken from the air and moisture from the soil into sugars and starches, necessary elements for plant growth. This manufacturing process is called photosynthesis. To carry on photosynthesis plants must have, in addition to light, proper temperatures and nutrients.
Measuring Light
Light is measured in foot-candles. One foot-candle is "the illumination at all points that are 1 foot from a uniform source of 1 candle-power of light. "The intensity of light varies with the seasons. In summer, it may reach 10,000 foot-candles or more during the brightest part of the day. This is too much light for African violets, begonias, and decorative green pot plants. During winter months, light intensity may be reduced to a meager 500 foot-candles. Clouds and smoke from factories also reduce light.
When light intensity becomes too low, plant growth slows almost to a halt, stems become weak, leaves thin, and flowers are paler than under normal conditions. Under too-high light intensity, plants tend to wilt, wither, and may become yellowed or show burned spots.
With optimum conditions such as good soil, correct watering, and proper temperatures, food production in plants is stepped up as they receive more light. To achieve maximum growth and flowering, you must regulate light intensity to make up for seasonal changes. Shade your greenhouse during summer to cut down the light; remove shade to admit more winter sun; brighten all dark corners with artificial light.
Artificial Light
Given proper temperature and humidity, many flowering plants, such as African violets, gloxinias, other gesneriads, and foliage plants, thrive under artificial light. The addition of fluorescent or incandescent light, or a combination of these, can convert dark, wasted space under benches and on window-less wall areas, as well as in basements and closets, into profitable plant-growing space.
Some greenhouse owners have found that fluorescent light speeds propagation and flowering of African violets, so they grow the plants in a combination of natural and artificial light.
Day Length
The growth and flowering of many plants depend on their daily hours of exposure to light-either natural or artificial. Without going into technical detail, this, roughly, is called photoperiodism, a phase of which is called day length. Plants are informally classified into three groups.
1. Dahlias, delphinium, pansies, tuberous begonias, and other plants which come into flower more rapidly during the long summer days of maximum light-or under the stimulus of artificial lighting-are called long-day plants.
2. Chrysanthemums, gardenias, poinsettias, etc., which start to flower when their light-exposure period goes down, are called short-day plants.
3. A third group contains plants-including African violets, carnations, and roses-which are unaffected by day length; these are called indifferent.
Science is now trying to determine whether plant growth and flowering are actually governed more by the daily period of uninterrupted darkness than by the length of exposure to light. Thus the plants that are now classed as long-day and short-day eventually may be called short-night and long-night plants.
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