Electronics > Power/Renewable Energy/EV's
IR lamp resistance
Faringdon:
Hi,
We are doing a Coffee shop outdoor heater.
We worry about the inrush into the IR lamp even though we turn on at zero cross. The lamp's resistance could be so low.
https://www.lamps2udirect.com/infra-red-heating-bulbs/infra-red-118mm-500-watt-slim-ruby-r7s-patio-heater-light-bulb/70605
For a 500W IR lamp, would you expect its resistance to be 115R?.....(when warmed up)....what would be the lowest resistance at say 10degC?...just before turning it ON?
Also, do you know where you can buy the holders for these lamps?...they are R7S holders.
bdunham7:
About 10 ohms. But surely you can just obtain one and measure it?
Faringdon:
Thanks yes, ours is 8.3R....but for how many mains cycles is the resistance that low?...how does res increase with time?
mikeselectricstuff:
--- Quote from: Faringdon on May 18, 2023, 02:25:31 pm ---Hi,
We are doing a pub outdoor heater.
We worry about the inrush into the IR lamp even though we turn on at zero cross. The lamp's resistance could be so low.
https://www.lamps2udirect.com/infra-red-heating-bulbs/infra-red-118mm-500-watt-slim-ruby-r7s-patio-heater-light-bulb/70605
For a 500W IR lamp, would you expect its resistance to be 115R?.....(when warmed up)....what would be the lowest resistance at say 10degC?...just before turning it ON?
--- End quote ---
Do you have a multimeter?
--- Quote ---Also, do you know where you can buy the holders for these lamps?...they are R7S holders.
--- End quote ---
Do you have Google ? "R7S Holder" would be a good start
Gyro:
--- Quote from: Faringdon on May 18, 2023, 05:26:53 pm ---Thanks yes, ours is 8.3R....but for how many mains cycles is the resistance that low?...how does res increase with time?
--- End quote ---
IR lamps have much heavier filaments than ordinary incandescents. Why don't you measure it and get an actual real answer rather than guesses!
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