My thoughts were if i could combine a bank of 1K. would it have the same effect as larger lights. I'm looking to get four of them as I figure a 4K light is good one to aim for. Also Why I would like to do this is that the lights could be split up when needed and could be easily managed power wise;)
Rather than re-inventing the wheel, you may want to look into ways of powering 4k HMIs off of standard wall receptacles. You can pick up a used 4k HMI Fresnel with electronic or magnetic ballast for very little money and power it off a 240V wall receptacle. There are a number 240V outlets in a typical house, office, or industrial plant in this country. The most common are air conditioner outlets, dryer outlets, range outlets, outlets for large copy machines in offices, and the outlets for motorized equipment in industrial plants.
If you look at the breaker of these circuits on the building service panel you will notice that they use two pole breakers - either 30A or 50A.. Each pole of the breaker is in a sense an independent 30A or 50A 120V circuit. That is, if you measure the voltage from each pole of the breaker to ground it will be 120 volts, and if you measure the voltage between the two poles of the breaker you will notice that it is 240 volts. The 120 volts of the two poles adds up to 240V because the 120V circuits are on opposing legs (and are therefore additive) of either a single-phase electrical service of a house, or a single-phase secondary step down transformer of a office or industrial plant. In residential settings, this is how higher voltages are supplied to household appliances like Dryers, Electric Ranges, Air Conditioners, Motors, etc. that require more power than can be reasonably supplied by a single 120V circuit.
Many of these household and industrial 240V receptacles use a three wire system (no neutral) because they are designed to power single phase motors or heating elements that draw a perfectly balanced load and return no current because the single phase service legs are 180 degrees out of phase and cancel each other out. How you use a 240V circuit to power a 4k HMI depends on whether the ballast is electronic or magnetic.
So that they can be used in both North America and Europe, electronic 4k ballasts are designed to operate at voltages between 95-150V and 195-250V. A power factor corrected electronic ballasts operating at 240 Volts of, say, a dryer plug will draw roughly 18.4 Amps on each leg of the single phase circuit, which is well within the capacity of these circuits which are usually rated at 20, 30, or 50 Amps per leg.
To operate a 120V 4k magnetic ballast from a 240V circuit requires a 240v-to-120v step down transformer like the 60A Full Power Transformer/Distro we make for the Honda EU6500is generators. Like it does with the 240V output of the Honda EU6500is Generator, our 60A Transformer/Distro can convert the 240 volts supplied by these industrial and household receptacles back to 120 volts in a single circuit that is the sum of the two single-phase legs of 30/50 amps each. That is how our 60A Transformer/Distro makes a 60A/120v circuit out of a “30A/240v” or a “50A/240v” circuit and is capable of powering bigger lights, like 4ks with magnetic ballasts, 5ks, or even a 6000W Six Light Mole Par, off a 6500W generator. It can also be used to power multiple 120V luminaries off of 240 Volt circuits because our Transformer/Distro automatically splits the load of whatever you plug into it evenly over the two legs of the 240V circuit so there is no neutral return.
You can maximize the power you can pull from these 240 Volt receptacles if, rather then plugging an electronic ballast directly into the 240 receptacle, you plug it in through a step-down transformer and operate it at 120 Volts. Where a 4k power factor corrected 4k electronic ballast at 120V draws only 36 amps, you will still be able to power additional lights, like a 1200 Watt HMI (11 Amps) and a 800 Watt HMI (8 Amps), of the same circuit.
For more detailed information on using 4k HMIs on standard wall outlets, I would suggest you read a white paper I wrote on the use of portable generators in motion picture production that will be available soon as an e-book from the Academy of Production Technology Press (APT.)( http://store.aptxl.c...ctCode=BK-PGMPP)
Harry Box, author of The Set Lighting Technician’s Handbook has cited my article in the just released 4th Edition of Harry Box's “Set Lighting Technician's Handbook” (http://www.screenlig...ml/BoxBook.html) and featured on the companion website “Box Book Extras." (http://www.screenlig...BookExtras.html) Of the article Harry Box exclaims:
“Great work!... this is the kind of thing I think very few technician's ever get to see, and as a result many people have absolutely no idea why things stop working.”
“Following the prescriptions contained in this article enables the operation of bigger lights, or more smaller lights, on portable generators than has ever been possible before."
The original white paper is still available online for free at
Guy Holt, Gaffer, ScreenLight & Grip, Lightng & Grip Rental in Boston