What is the efficacy of a metal halide lamp?

What is the efficacy of a metal halide lamp?

around 75 – 100 lumens per watt
Metal-halide lamps have high luminous efficacy of around 75 – 100 lumens per watt,[2] about twice the efficiency of mercury vapor lights and 3 to 5 times that of incandescent lights,[1] moderately long bulb life (6,000 to 15,000 hours)[2][3] and produce an intense white light.

What is the CRI of metal halide?

65-90 CRI
Metal halide offers excellent color rendering, with a 65-90 CRI (color rendering index). Metal halide generates high light levels from a compact light source.

How do you calculate the heat gain of a light?

Fs is constant for given fixture. Sensible Heat Gain = W * Fs * 3.41 = 320,000 * 1.2 * 3.41 = 1,309,440 btu/hr. 30% of heat to ceiling plenum, 70% (0.7) to space….Heat Gain from People.

Q-ps	= N-p * qs * Fu * CLF-h	(sensible heat gain)
Q-pl	= N-p * ql * Fu	(latent heat gain)

Do metal halide lamps need a 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 hot does a metal halide bulb get?

2000 degrees Fahrenheit
When fully lit, the Metal Halide lamp will reach a temperature of 2000 degrees Fahrenheit and operates at a vapour pressure between 70 and 90 pounds per square inch.

How do you calculate heat gain?

The formula used to calculate heat gain from thermal conduction (outside ambient temperature during the cooling season) is the same basic formula as the Heat Loss Formula, [(Square Foot Area) x (U-Value) x (Temperature Difference)].

How much does it cost to run a 400W metal halide?

At an average cost of 0.09 cents per kilowatt, a system of 1,000 400-watt Metal Halide fixtures costs $41.22 per hour. If the fixtures run an average of 730 hours every month (730 x $41.22), it ends up costing $30,090.60 every month or $30.09 per month in energy per fixture.

How many lumens is a 400W metal halide?

24,000
Mean lumens typically list the lumen output left when a lamp reaches 40% of its rated life. The mean lumens for the 400W metal halide lamp is approximately 24,000. The recommended replacement for the 400W metal halide flood is the 120W HyLite LED Prizm, producing approximately 13,000 lumens.

What voltage does a metal halide ballast put out?

120-277V
Most metal halide ballasts operate on 120-277V. These are called 4-tap ballasts and they operate 120/208/240/277V. You will also see 120-480V ballast, which is called a 5-tap ballast.

How many Watts Does a metal halide lamp produce?

So in keeping in the characteristics of metal halide they would produce the light output of a 400 WMH lamp in roughly 5,000 to 6,000 hours of use. This means that you are only getting 50% of the output from your 1000WMH, but you are still burning 1058 watts.

How long does a metal halide lamp last?

As a result, metal-halide lamps have high luminous efficiency of around 75 – 100 lumens per watt, which is about twice that of mercury vapor lights and 3 to 5 times that of incandescent lights and produce an intense white light. Lamp life is 6,000 to 15,000 hours.

How does the sodium ion in a halide lamp work?

Once the arc tube reaches its running temperature, the sodium dissociates from the iodine, adding orange and reds to the lamp’s spectrum from the sodium D line as the metal ionizes.

How does a probe start lamp reduce heat loss?

Without the probe electrode, the amount of pinch (or seal) area at the end of the arc tube is reduced, which results in a reduced heat loss. Furthermore, using an ignitor with a lamp reduces the tungsten sputtering by heating up the electrodes faster during starting. Warm-up time is also reduced.