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Philips HF-Basic II Instant Start Ballast
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I've never seen these before, but apparently I own a few of them lol! These have replaced the burned out Chinese Helvar HF ballasts in some Thorn Aquaforce fittings I'm currently repairing/re-gearing. The fittings will not be switched regularly so the instant cold start shouldn't be an issue.
These really do instant start too, as soon as the fitting's powered up the tubes strike with a horrible purple glow around the unhappy cathodes momentarily!
Interestingly there's no mention of EOL protection, I suspect this would roast EOL tubes!
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Less chance of killing the ballast if it has one good lamp when an EOL happens.