[00:22:10] We’ve also got an array of ballasts. Now the ballasts fundamentally are the engine of the light; without the ballast, the lamp wouldn’t fire. There’s igniters in there, capacitors and transformers. What happens is there is a pulse frequency that gets pushed through the lamp, causes the lamp to explode if you will, probably not the right terminology, but the lamp fires up and then a trickle current steps in and keeps the lamp running. Now, the beauty with using high pressure sodium high intensity discharge lighting, otherwise known as HID is they are very inexpensive to run. They are not inexpensive to buy however, but once you have them, and you’re using them, they are very, very inexpensive to run. Typically, 400 watt high pressure sodium on a 20 hour light cycle will set you back no more than £12 a month to run, which you can see if you compare that to an incandescent or fluorescent

light, you’ll be talking 10 to 20 to 30 times the cost. So, that’s how they work; they’re transformers, igniters and capacitors all built in together in order to fire the HID lamps up, the high intensity discharge lamps. Now, our particular lights that we’ve opted for are dual ballasts; they will run high pressure sodiums or metal halides. So, all we have to do is unscrew the lamp and screw a new lamp in.

Most ballasts in the UK are designed like that; some older or cheaper ones are not. Some cheap ballasts and lights are only designed to run metal halides and others are only designed to run high pressure sodiums. So, don’t buy cheap otherwise you’ll be buying twice and it’ll cost you more money. And that’s one thing that has to be said about HID lights; there are very, very cheap ones on the market currently, and they’ve dogged the market and for quite a few years, however, they’re becoming more and more popular and Christ knows why! These particular lights fundamentally are the same type of gizmology or the components...