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Thanks sm1thson for the formula, I calculated the current to 9 amps and my power supply won't handle that. electronicsuk, you're right, I need a beefier power supply, or a different battery. I now know the reason for the bulb not illuminating, thanks to all for your help.

Strangely enough, it is from one of the big yellow torches. Stamped on the bulb holder is 6V 55 watts

My bench power supply reads 100Ma when 6 volts is applied to the bulb. 100Ma is not top of the scale, but the voltage drops away to zero. Don't understand it.

I have a 6 volt quartz halogen bulb from a torch, which won't light when 6 volts DC passes through it, but will light up with 2.5 volts AC. Any ideas as to what the problem might be??

Cheers, I'll have a look tonight .

Haven't looked that closly to be honest, it just says Concord wrs on the front by the pilot observation panel.

Cheers for that, I think it's time to pass the job on to someone who has a better idea of what's needed.

No idea.

Not corgi registered. I'm an electrician

I need to replace the thermostat on a Concord wrs boiler which is located in an awkward position. Does anyone know the model of thermostat required so that I can purchase one before I attempt to remove the cover from said boiler. Thanks