RSP Astrum LED rear light

I bought one about 6 years ago in Melbourne Australia and it has outlasted about 10 chinese rear lights. The clamp went but the waterproofing was (though insufficience for British weather perhaps) superior to its East Asian competitors, some of which looked similar. The button is better and easier to use even in thick cloves. After the clamp died I bolted the base to my rear panier with a countersuck headed bolt. The light has at last given up the ghost at least on one side, due to water damage. I was thinking of trying to persuade a British supplier to send me one here to Japan from the UK but I note that it is over ten times the price of cheap Chinese ones even without shipping costs so I think I will continue to use Chinese lights adding (suggested here) vaseline and perhaps silicone sealant. I am missing this light though. The seal is not great, but it is better than many.

Update. I really want another Astrum in 2022.
The cheap (3-4USD) Chinese lights mentioned above, that look vaguely similar with two ".05" watt LEDS, but  LESS waterproofing also have a design flaw these days in that they have a new feature, from about three years ago, that prevents the user from switching the light off when the batteries are 'low.' Since the manufacturers are careful to ensure a safety margin this 'low' battery feature kicks in after about a week or two of use, especially in cold weather when the batteries are cold.  When my hands are cold, removing the batteries is a painful process. RSP Astrum lights are available on ebay from the UK at 49UKP including shipping to Japan which is expensive. The lights themselves are only 20UKP -- hightly recommended.

The majority of other lights these days tend to be USB charged with a non-removable battery. What if you want to get on your bike and the rear light is not charged? Because you have not ridden for a while or are using  different bike or you just forgot to charge. You have to wait. I don't have that time. I want to be able to put (rechargable or non rechargable) batteries in the light. 

The new RSP rear light LAA730 is also a rechargable light with non removable batteries.

Got my first light 2 years ago and have just had to replace with No. 5. I do love this light especially when it's dark enough I can look in my mirror and see road signs far behind lit up in red reflection! The first 2 broke off and although I retraced for miles I never found them; the third I heard fall off and saved it as a working light needing a new means of attachment and the fourth broke last Sunday but I'd tied a plastic coated thin garden wire around the middle which was then looped over the tensioning nut (very quick to remove and put back on) so all that happened was that it dangled slightly lower down and I was able to secure the light to the seatpost using that wire which had been on since No. 3 broke so I've now got that light and it's rechargeable batteries which are now in No. 5.
Does anyone know if the newer USB version has a modified attachment clip? as I now need another spare for WHEN this one breaks off. There are various other 1W rear lights that I might have to try as these continue to fall off.
The offending clip can be removed via 3 very small screws but I'm sure that replacements aren't produced but I'd love one in metal! - or made on a 3D printer.

I've had a few of these, and for the money they are a great light. However, they dont play nice with potholes, I've had two self-destruct on me after hitting a bump. The back falls out and then scatters over the road spilling your batteries. I've had to tape them together to stop them doing that.

The bracket on my Radient (similar model but with USB charging) has just snapped due to rough roads. Clip left attached to bracket as per @paulfrank post.
A shame as its a great light otherwise.

Mine has been brilliant after sealing with some baseline but if you are running lots of miles on rough roads like the potholed nightmares around Telford you might find it self destructing like mine leaving the clip firmly clamped in the bracket but missing the light itself. Hopefully RSP will do a Mk.II with a strong case for those cracking LEDs.

Shame the seal isn't great, I'd been looking at one of these to supplement my Nite Rider Cherry Bomb for the winter.