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    maintenance engineer for commericial buildings (not normally theatre related)
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    adam gage

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    Current affairs enviroment/energy saving, renewable energy, railways, electrical equipment whether theatre related or otherwise.
    Lighting technology of all sorts, gas, oil, or electric, old or modern, theatre related or otherwise.

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  1. To add to the points already made, note that incandescent lamps are very sensitive to variations in supply voltage. At 220 volts they will be significantly dimmer than at 250 volts, and both these voltages are within the expected and permitted range. I have seen as low as 200 volts at the lantern, that will give a decidedly inferior light with incandescent. LED lanterns by contrast use a regulated power supply and will give constant light at any reasonable voltage. LEDs will therefore seem much better in comparison with incandescent in a venue with a low supply voltage than in one with a generous voltage.
  2. As others have said, it might be worth accepting the risks of breakage. (In the event that breakage occurs, clear up the bits AT THE TIME as earlier described, and thoroughly vacuum clean the area before the next performance) If however further protection against against breakage is considered essential, then this may be achieved as follows. Coat one side of the article in Copydex or similar flexible adhesive. Before the adhesive dries, affix a suitably sized piece of mesh or scrim, then brush another layer of adhesive over the scrim. Do this on the least seen surface of the article, probably the inside of cups and the underside of saucers or plates. The articles can still be broken, but the pieces remain attached to each other, with minimum risk of sharp pieces scattering.
  3. If power is reasonable, consider cheap industrial halogen floodlights as used on building sites. 12 lights each of 500 watts should suffice, and may be powered from a couple of 13 amp sockets, NOT one twin socket, and preferably not on the same circuit. they are very cheap to replace if lost or damaged, and light in weight which simplifies mounting. As others have said, be prepared for bad/random behaviour by both spectators and talent.
  4. adam2

    Lee Colour

    ISTR that the preferred or official shade of blue in the French flag was recently changed. The old blue was a bright blue similar similar to that used in the EU flag, the new blue is darker and more like a navy blue. Actual flags flown on public buildings seem to vary a lot. I doubt that the exact colour matters much provided that is easily recognised as a French flag
  5. If the O/P IS in Japan, and the later post that refers to 100 volt circuits strongly suggests this, then that is another reason to go LED. The market for 100 volt incandescent lamps was always rather limited, much smaller than the market for 120 volt or for 230 volts. Japan is the only major country that uses 100 volts. Lamp supplies are therefore likely to dry up before the more common voltages. Most multi voltage LED lanterns will operate down to 90 volts (100 volt nominal supply, at about 95% of nominal, less about 5% voltage drop in the fixed wiring and in extension leads) An LED fixture should give full output down to 90 volts, a 100 volt incandescent lamp run at 90 volts will give about half light output.
  6. a very simple possible cure would be to replace a couple of the 1 watt LED lamps with incandescent lamps, whilst one lamp would probably do, two gives redundancy against one lamp failing. Use of a lantern using hundreds of watts is rather wasteful, esp at todays electricity prices. Or as already suggested, an incandescent 60 watt lamp somewhere out of sight.
  7. A two pin Euro plug suggests 220/230 volts, but do not count on this. Preferably seek confirmation from the supplier as to supply voltage, if not available then try 110/115/120 volts first. If it works correctly dont use 220/230 volts. An led array might well be multivoltage but do not count on this
  8. For a tungsten lamp operated at full power, simply multiply the load in kilowats by the operating time in hours to get the total energy consumed in KWH. For example 12 kw of lamps used for 3 hours will be 36 kwh consumed. Multiply this consumption by the price that you pay per unit, in order to get the expense, for example 36 kwh consumed at 40 pence per unit will be 1440 pence, or £14-40. This ignores the standing charge which is reasonable since that is payable whether or not the lighting is used. Lamp replacement costs are extra. For lamps used on a dimmer the position is more complex, I would calulate asabove, and then deduct say 25%
  9. about nil.few situations would need over 100 amps in a small area, and a lot of premises only have 100 amps per phase available in any case. A unit with a total capacity of 104 amps would need to accept at least 35mm cable which is rather unmanageable. The 13 amp fused version would be useful in homes and workplaces where large numbers of low loading appliances are expected, E.G. TV set, a couple of lamps, laptop pc, cellphone charger, cable TV box, iternet router etc. The unfused version would be suited to heavier loads as found in kitchens etc.
  10. I do not think that the original MAPLINS were well run, especialy in terms of the range of components offered. A few examples include, small silicon power diodes in a wide range of voltage ratings, all at the same price. Why ? who wants a 50 volt PIV diode when the 1000volt version is the same price.Or 8 watt fluorescent tubes in 12 volt and in 240 volts Why ?they are the same thing thing, the operating voltage is determined by the control gear not the lamp. And a vast choice of 5mm LEDs, only really needs two versions in each colour, a chep one and an an ultra bright one. Despite these shortcomings I still found them useful.
  11. If you are satisfied as to the structural reliability and the ONLY concern is the creaking noises, then these can be reduced by puffing talcum powder into the creaking parts. This acts as a lubricant and allows wood to move relative to other wooden parts in silence. If however there is any doubt about the structure then this needs attention to strenthen it.
  12. These linear halogen lamps are indeed very popular, and are still widely available. Eventually, manufacture or import will presumably be banned but not just yet. at present, these lamps are cheap enough that even a village hall should be able to afford a few dozen spares.lLess than £1 each if you look around. On a more general note, might I appeal to venues and to individualls NOT to dispose of unwanted, surplus, or obsolete incandescent lamps of any type . If you or your venue no longer want them someone else may need them.
  13. LEDs are the future, and can save a lot of money for long hour use in a workplace, but the economics are still doubtful for limited use, as described above. In the longer term it is likely that halogen lamps will be banned, not just yet though. Any such ban will be on manufacture or import, restrictions on sale or use of existing stocks seem unlikely.
  14. Are these for lighting the acting area ? in which case dimming is probably required, and colour changing is potentialy useful. Or are they working lights for an area behind the stage and out of sight of the audience ?
  15. And in Scotland a new and very large pumped storage power station has been approved, with an output of 1,500 MW and able to maintain that output for about 20 hours. That will help a lot in the event of a black start. Controls, instruments and emergency lighting would need power, but the modest demand is easy to supply from batteries or a diesel generator. https://www.sse.com/news-and-views/2023/03/britain-s-largest-pumped-hydro-scheme-in-40-years-gets-100m-investment-boost/
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