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Light Bulb Maximum Output? Answered

I am trying to fix a broken spectrophotometer that is valued at well over a thousand dollars. The problem: looking in the light bulb compartment, it seems the tungsten-halogen lamp is pretty dim. The bulb is rated for 6V. Using a multimeter, it appears to get about 8 volts. Could too much voltage cause the bulb to be dim? If so, How can I lower the voltage to 6? Would a resistor work? Thanks!

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iceng

5 years ago

I help design photospectrometers for the food industry.

Older spectrophotometers features had an automatic bulb intensity sensor that can raise the power to the bulb for maintaining the output intensity as as the bulb aged.

What I mean, is don't assume you can redesign a meter that was manufactured for sale.

Of course you could have a PHD in which case don't meddle with electrical engineering.

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steveastrouk

5 years ago

If this thing is old, there's a good chance the bulb has faded because metal from the filament has evaporated onto the glass - are you sure its a halogen bulb ? Change the bulb. OVER voltaging filament lamps, like LEDs will kill them very quickly.