I've installed a UV-light antimicrobial unit in my drinking water system. It works great (I think--we're not sick yet), but the UV light needs to be replaced every year. The UV bulb itself is just a flourescent bulb without the phosphor coating. The replacement unit from the company costs $29 and includes a plastic endcap, wires soldered to the UV bulb, and a small incandescent "power-on" indicator bulb. The incandescent bulb is soldered between one of the 4 power leads and a cathode lead on the UV bulb.
The actual UV bulbs only cost $5 each, so I'm obviously interested in modifying this setup so I can just replace the UV lamp. (ER math: saving $24 per year at 4% withdrawal rate= this fix is worth $600 in the bank). I'm thinking of just de-soldering the leads from the UV lamp and replacing them with appropriate connectors, leaving out the little incandescent bulb.
Does anyone here know if there will be a downside to leaving out the incandescent indicator bulb? The incandescent bulb doesn't serve a function as far as I'm concerned, and it actually introduces a failure mode (since it is wired in series with the UV lamp, if the little indicator bulb burns out my UV lamp loses power and my family is drinking microbes). But, electronically is it possibly serving some function (current limiting?), or will my UV lamp work just fine without it? (The output from the ballast/transformer that feeds the unit is 44VAC, 6watts, if that makes any difference).
Thanks for any input.
samclem
The actual UV bulbs only cost $5 each, so I'm obviously interested in modifying this setup so I can just replace the UV lamp. (ER math: saving $24 per year at 4% withdrawal rate= this fix is worth $600 in the bank). I'm thinking of just de-soldering the leads from the UV lamp and replacing them with appropriate connectors, leaving out the little incandescent bulb.
Does anyone here know if there will be a downside to leaving out the incandescent indicator bulb? The incandescent bulb doesn't serve a function as far as I'm concerned, and it actually introduces a failure mode (since it is wired in series with the UV lamp, if the little indicator bulb burns out my UV lamp loses power and my family is drinking microbes). But, electronically is it possibly serving some function (current limiting?), or will my UV lamp work just fine without it? (The output from the ballast/transformer that feeds the unit is 44VAC, 6watts, if that makes any difference).
Thanks for any input.
samclem