Wireless Light Sensor

wireless light sensor
    light sensor
  • Photosensors or photodetectors are sensors of light or other electromagnetic energy. There are several varieties: *Optical detectors, which are mostly quantum devices in which an individual photon produces a discrete effect.
  • A sensor, usually located in the windshield, that senses the absence of light and turns the headlights on.
  • If selected, an ambient light sensor will automatically adjust the brightness of the TV's backlight, according to how dark or light the room is.
  • radio: medium for communication
  • Lacking or not requiring wires
  • having no wires; "a wireless security system"
  • transmission by radio waves
wireless light sensor - Maxxima MLN-10
Maxxima MLN-10 LED Night Light with Sensor (Pack of 4)
Maxxima MLN-10 LED Night Light with Sensor (Pack of 4)
The Maxxima nightlight employs LED (Light Emitting Diode) technology which is revolutionizing the lighting market. Since LEDs consume 10 percent of the energy of incandescent lamps, this Night light should cost no more than sh.25 cents a year to operate when used an average of 10 hours a day. Use it in bathrooms,kitchens, senior living quarters, vacation homes, etc. The LED in this light gives off an agreeable comfortable sky blue glow. Features: Photoelectric eye turns light on at dusk and off at dawn Sky blue light No bulb replacement Save money on energy & bulb replacement Costs .25 cents per year to operate No heat from lamp Spread beam optics for maximum illumination LED rated at 100,000 hours 11.5 years continuous use-10 hours per day Versatile use Consumes 10 percent of the energy of incandescent 360 degree rotating head for directional illumination 110V Operation Only - 4 Pack

77% (11)
Pumpkin Crunch
Pumpkin Crunch
This is pumpkin crunch, as baked by Janelle. Pumpkin crunch is almost like pumpkin pie, but the preparation and precise ingredients are a bit different. (Our recipe is available upon demand and will be posted into this comment if two or more people request it; Googling for it may turn up variations on the recipe. Two people requested it - the recipe is posted below.) Pumpkin pie is my absolute favorite pie, yet I found pumpkin crunch to be even better. Lighting info: Olympus FL-50R flash was used remotely and triggered via the Olympus wireless flash system. The flash was positioned to my left and about two or three feet behind me with a diffuser mounted, angled to point slightly above the pumpkin crunch. The pumpkin crunch was placed next to a wall which helped a bit with balancing light at the back end. Lighting power was adjusted via TTL, although I don't remember whether the flash exposure bias was adjusted (if anything, I probably adjusted it to -0.3). The on-camera flash used to trigger the FL-50R was fired at the "low" power trigger setting so as to minimize its impact on the picture. Note that the FL-50R could still be triggered even though there was no direct line of sight between the optical sensor on the flash and the camera flash. Some lighting was also contributed by a room light mounted to the ceiling ~9 feet up, which was two incandescent bulbs surrounded by an opaque glass dome. "Studio" info: the pumpkin crunch was placed on a sheet of wax paper, layered over a bamboo cutting board. I felt that the cutting board and wax paper looked somewhat classy, so I wanted to ensure that they (especially the cutting board) was included in the picture but did not detract too much from the pumpkin crunch itself. Initial shots were done in landscape orientation, but the frosting on the pumpkin crunch proved to be more interesting (and perhaps appealing) then seeing the edge of the pumpkin crunch. I wanted to incorporate a relatively shallow depth of field to add to the artistic impact of the picture, and thus it was critical to have something with depth to use it on. Going with the portrait-frame orientation made sense. I chose to take it from one of the edges (as opposed to straight-on) as it seemed a bit more interesting from that angle. As I lack any interesting kitchenware or placement items, I cleared the area and just allowed the bare wall to act as the backdrop. Given the shallow depth of field, the wall doesn't very wall-ish and the imperfections in the paint job can't be seen. ------------------ Recipe Ingredients 1 can (1 lb. 13 oz.) pumpkin 1 can (12 oz.) evaporated milk 1 cup sugar 3 eggs, lightly beaten 1 tsp. cinnamon 1 box (18.25 oz.) yellow cake mix 1 cup nuts, chopped (note: we used walnuts) 1 cup butter or margarine, melted Cream Cheese Frosting (note: we used just plain Cool Whip for frosting instead) Instructions Preheat oven to 350?F (note: if you're using a dark pan, as opposed to a glass one, try using 325?F instead). Combine pumpkin, evaporated milk, sugar, eggs and cinnamon; mix well. Pour into 13x9x2-inch pan lined with waxed paper. Sprinkle with cake mix evenly over pumpkin mixture, then sprinkle with chopped nuts and press them lightly into the mixture. Drizzle with melted butter. Bake for 50 to 60 minutes. Cool, then turn out on a rack and frost. Makes 16 servings. Prep time: 1 hour 10 minutes. Cream cheese frosting prep: (optional; you can go with a frosting of your choice if you like. The frosting pictured above is plain, unmodified Cool Whip) Blend together 8 oz. cream cheese and 1 cup powdered sugar. Fold in 8 oz. thawed frozen whipped topping. ------------------ Shot with an Olympus E-520, Zuiko Digital 50mm Macro lens, and an Olympus FL-50R flash used off-camera and triggered wirelessly. This picture is uncropped, but the maximum resolution has been scaled down for upload. This is a camera-derived JPEG that has not received any additional post-processing. The following settings were used on-camera: contrast, saturation, and sharpness at +1; "vivid" color scheme; white balance set to auto; flash trigger at "lo" and flash TTL exposure compensation at -0.3 (I think).
Wireless radio trigger maximum sync speed
Wireless radio trigger maximum sync speed
The Nikon D70 and D50 have an electronic shutter that allow the use of very high shutter speeds (= short exposure times) with flash. However, if the flash is triggered by a wireless radio trigger, the trigger adds a delay that limits the highest usable shutter speed. If a trigger is used with a too short exposure time, not all of the light from the flash has time to enter the sensor. Here are the results of a test where I test what are the shortest exposure times that I can use with my flashes and wireless radio triggers. Test results The shortest exposure times that don't affect the amount of light captured from the flash are approximately: SB-16 - 1/8 power: 1/1000s SB-800 - 1/16 power: 1/1000s - 1/4 power: 1/750s - 1/1 power: 1/250s SB-24 - 1/16 power: 1/750s - 1/4 power: 1/750s - 1/1 power: 1/250s Elinchrom D-lite 4 - 1/16 power: 1/125s - 1/4 power: 1/180s - 1/1 power: 1/250s Notice that the duration of a flash depends on the power setting. The speedlights have a lower sync speed at full power, because the flash duration is longer than the available exposure time after triggering delay. With the D-lite monoblock it is the other way around: the flash duration is longer at low power and faster at full power. One interesting finding is that the color temperature of the speedlights is warmer with full power than with small powers. The D-lite monoblock is warmer than the speedlights at all powers. Test setup The tests were made with a Nikon D70 on a tripod and a Nikkor 50 mm f/1.8 lens at f/13. The test target was a white wall illuminated with each flash on a light stand. The aperture was kept constant, and the flash was in manual power. The light stand was moved closer or further from the test target to get approximately same exposure with each flash power. White balance was set to "flash". The patches are 100% crops from the test photos. The radio trigger I use is a two channel model from the eBay seller Link-Delight.

wireless light sensor
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