I have a pretty old (30+ years) Hayward 12 volt 300 watt sealed beam fixture that is getting harder and harder to maintain - because that's whats happened to the cable - it's like the coil spring out of a car. Has anyone successfully upgraded one of these to an LED type - Hayward or other mfg - without changing the niche? I would rather avoid busting up the concrete decking which the latter would involve. Thanks for any suggestions.