What type of lamps have a start up time?

What type of lamps have a start up time?

Metal halide (MH) lamps do not achieve their full light output immediately after starting. Rather, they require a period of time-1 to 15 minutes-to reach 90% of their full light output. This period is called the warm-up (or run-up) time.

What is HPI lamp?

MASTER HPI/HPI Plus lamps are single ended metal halide lamps consisting of a quartz discharge tube, containing high pressure mercury and a mixture of metal halides, which is housed in a hard glass outer envelope, fitted with a standard screw base. They are available in either ovoid coated or clear tubular versions.

What is a Metalarc bulb?

METALARC-Metal-Halide-Lamps High efficiency, bright white light for commercial lighting applications. High performance SYLVANIA METALARC® metal halide lamps are among the most energy efficient sources of white light available today for high and low-bay interior and exterior, street and area lighting applications.

How long does it take for a metal halide bulb to cool down?

Metal halides require a warm-up time that can be anywhere from 1 to 15 minutes. Cool Down Period: If power to the metal halide shifts or is disrupted, the lamp will automatically turn off. MH lamps need at least 10 to 15 minutes to cool down before they can be turned back on.

Do HID lamps start instantly?

Most HID lamps such as sodium vapor require few minutes of start-up time until the heat and pressure inside the tube is high enough for the lamp to reach the maximum brightness (in case of sodium vapor lights for sodium to vaporise).

Is LED bulb better than CFL?

Efficiency—While incandescent bulbs and CFLs generate most of their energy in heat, LEDs are cool to the touch—which translates into less wasted energy. LEDs are more efficient than even CFLs: A 16.5-watt LED bulb is equivalent to a 20-watt CFL and a 75-watt incandescent.

What produces the light in a metal halide lamp?

Metal halide lamps produce light by passing an electric current through a combination of mercury and metal halide gas. They function very similarly to other gas-discharge lamps (e.g. mercury vapor) – the principal difference being the composition of the gas.

What is a Balaster?

ballast – A device required by electric-discharge light sources such as fluorescent or HID lamps to regulate voltage and current supplied to the lamp during start and throughout operation.

What is an HPS light?

High pressure sodium vapor (HPS) lights, similar to LPS lights, are a specific type of gas- discharge light (also known as a high intensity discharge, HID or arc light). As indicated by the name, “high” pressure sodium vapor lights operate at a higher internal pressure.

Do Metal Halide bulbs require ballast?

Metal halide (MH) ballasts are required to start the lamp, regulate the lamp starting and lamp operating currents, and provide appropriate sustaining supply voltage. MH lamp voltage typically increases over time, and the ballast must continue to provide sufficient voltage to the lamp as it ages.

How long does it take for a lamp to cool down?

In less than an hour, a typical home light bulb will cool to room temperature.

Which lamp has the longest life expectancy?

LEDs
LEDs usually have the longest lifespan, often lasting over a decade. Mostly, they are several times better than incandescent bulbs and most fluorescent bulbs.

What is warm up and restrike time for metal halide lamps?

This period is called the warm-up (or run-up) time. After a lamp has been on for a period of time and then extinguished, it cannot be immediately turned back on. Before the lamp can be turned back on, the arc tube must have a chance to cool down or the lamp will not restart. This period of time is called the restrike time.

How long does it take a HID lamp to warm up?

HID lamps require time to warm up. It varies from lamp to lamp, but the average warm-up time is two to six minutes. HID lamps have a “restrike” time, meaning a momentary interruption of current or a voltage drop too low to maintain the arc will extinguish the lamp.

What’s the restrike time for a pulse start lamp?

Before the lamp can be turned back on, the arc tubemust have a chance to cool down or the lamp will not restart. This period of time is called the restrike time. Restrike times for traditional probe-start MH lamps can take 15 minutes or longer, but restrike times for pulse-start MH lamps are generally much shorter (see Figure 4).

Can a lamp be turned back on after it has been extinguished?

After a lamp has been on for a period of time and then extinguished, it cannot be immediately turned back on. Before the lamp can be turned back on, the arc tubemust have a chance to cool down or the lamp will not restart.