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An HPS (High Pressure Sodium) grow light bulb in an air-cooled reflector with hammer finish. The yellowish light is the signature color produced by an HPS. High-pressure sodium lights are a more efficient type of HID lighting than metal halides. HPS bulbs emit light in the yellow/red visible light as well as small portions of all other visible ...
A high-pressure sodium street light in Toronto A high-pressure sodium-vapor lamp An HPS lamp that isn't entirely off. A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm. Two varieties of such lamps exist: low pressure and high pressure.
Best Grow Light Bulb: GE BR30 Grow Light Bulb. 1. GrowLED. Best for Herbs.
The arc-tube operates at anywhere from 5–50 atm or more [8] (70–700 psi or 500–5000 kPa) and 1000–3000 °C. [9] Like all other gas-discharge lamps, metal-halide lamps have negative resistance (with the rare exception of self-ballasted lamps with a filament), and so require a ballast to provide proper starting and operating voltages ...
Diagram of a high-pressure sodium lamp A high-pressure sodium lamp, Philips Master SDW-T 100W. Various types of chemistry are used in the arc tubes of HID lamps, depending on the desired characteristics of light intensity, correlated color temperature, color rendering index (CRI), energy efficiency, and lifespan. Varieties of HID lamp include:
The FEL lamp (less accurately called a light bulb) is an ANSI standard 1000 watt quartz halogen lamp with a G9.5 medium 2-pin base used in many stage and studio lights that costs around $12 and is available from a number of manufacturers including GE, Osram, Ushio, Eiko, and Philips. Note that the term FEL is an ANSI designation (not an acronym ...
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