Does this MH lamp exist?

[Daniel Stern Lighting]

I've just been thrown something of a curveball. I need to source a
Xenon-MH lamp and ballast with the following specs, and have no idea if
such an animal exists or not:

LAMP:

Flux: 10,000 to 15,000 lumens

CCT: 4000K to 6500K

LCL: approx. 38mm

Rapid-strike ( <=1 sec to 60% flux)

Hot-restrike tolerant

Nominal 12VDC input

System wattage <= 150W

Lifespan of at least 3000 hours

Does this ring any bells for any of you?

DS

 

[Victor Roberts]

I've just been thrown something of a curveball. I need to source a
Xenon-MH lamp and ballast with the following specs, and have no idea if
such an animal exists or not:

LAMP:

Flux: 10,000 to 15,000 lumens

CCT: 4000K to 6500K

LCL: approx. 38mm

To get above 10,000 initial lumens you would need a 150 wall metal
halide lamp. (GE Pulsearc 70W MH generates 5500 initial lumens at
3200K, less at other color temperatures while the GE Pulsearc 100W MH
generates 9000 initial lumens at 3200K, less at other color
temperatures. The GE Pulsearc 150W generated 12500 initial lumens.)

The LCL for the GE 70W, 100W and 150W is 3.43 inches or 87mm, much
larger than you want.

Venture has a 125W Uni-Form Pulse Start lamp that produces 12,000
initial lumens at 4000K, but LCL is 3 3/8 inches. Do you really mean
LCL, or arc length?


GE has a 150 watt Arcstream lamp that produces 10,000 initial lumens
at 5000K and has an LCL of only 1.12 inches or 28.5mm, so it meets
your LCL requirement, but the power will be over 150 watts with
ballast.

Most requirements below this line are more a function of the ballast
than the lamp.

Rapid-strike ( <=1 sec to 60% flux)

Hot-restrike tolerant

Nominal 12VDC input

System wattage <= 150W

With proper ballast you could meet all these with any MH lamp.

Lifespan of at least 3000 hours

How many hours per start?

 

[JB]

To get above 10,000 initial lumens you would need a 150 wall metal
halide lamp. (GE Pulsearc 70W MH generates 5500 initial lumens at
3200K, less at other color temperatures while the GE Pulsearc 100W MH
generates 9000 initial lumens at 3200K, less at other color
temperatures. The GE Pulsearc 150W generated 12500 initial lumens.)

The LCL for the GE 70W, 100W and 150W is 3.43 inches or 87mm, much
larger than you want.

Venture has a 125W Uni-Form Pulse Start lamp that produces 12,000
initial lumens at 4000K, but LCL is 3 3/8 inches. Do you really mean
LCL, or arc length?


GE has a 150 watt Arcstream lamp that produces 10,000 initial lumens
at 5000K and has an LCL of only 1.12 inches or 28.5mm, so it meets
your LCL requirement, but the power will be over 150 watts with
ballast.

Most requirements below this line are more a function of the ballast
than the lamp.



With proper ballast you could meet all these with any MH lamp.


How many hours per start?

The above spec is not a traditional 'commercial' MH lamp.
The 'Xenon-MH' lamps are more likely to be MSR/MSD/HMI types.
The giveaway is the HR tolerant which the standard types certainly are not.
They flash over inside the outer envelope or lampholder.
Also the fast run up is indicative of a high xenon pressure MH lamp.
Sounds like a projector or photo-studio type to me.
The ballast can be designed with any input voltage.
If you need a 12V ballast for any of the above types, email me off group.
HTH,
JB

 

[Victor Roberts]

The above spec is not a traditional 'commercial' MH lamp.
The 'Xenon-MH' lamps are more likely to be MSR/MSD/HMI types.

Sorry, I missed the "xenon" part.

The giveaway is the HR tolerant which the standard types certainly are not.

Most any MH lamp can be hot restarted with the proper ballast.

They flash over inside the outer envelope or lampholder.

Yes, flash over can be a problem if you try to hot restart a lower
power, single-ended MH lamp, but higher power MH lamps and most
double-ended MH lamps should be able to accept the hot restart voltage
from the ballast without flashover. The flashover problem is mostly
in the socket or lamp base.

Also the fast run up is indicative of a high xenon pressure MH lamp.

If I had not missed the "xenon" part I also might not have missed the
fast run up requirement

Sounds like a projector or photo-studio type to me.

Why do projector lamps need fast run up? I thought this "need" was
limited to automobile headlamps.

 

[JB]

Sorry, I missed the "xenon" part.
not.

Most any MH lamp can be hot restarted with the proper ballast.


Yes, flash over can be a problem if you try to hot restart a lower
power, single-ended MH lamp, but higher power MH lamps and most
double-ended MH lamps should be able to accept the hot restart voltage
from the ballast without flashover. The flashover problem is mostly
in the socket or lamp base.


If I had not missed the "xenon" part I also might not have missed the
fast run up requirement


Why do projector lamps need fast run up? I thought this "need" was
limited to automobile headlamps.

Replace "need" with "want" and you have the answer. And of course the
corresponding extra $$$ in ballast costs.

JB