That is weird, are you sure they're working correctly? My understanding is that nearly all dynamo lights sold today have a standlight built in. 8 years ago, before modern dynamo technology made dynamo lighting feasible, you used to commonly be able to buy dynamo lights without a standlight. But as far as I can tell, that is no longer the case today.

Are you sure your light is not defective? This is what the Peter White site has to say about that -

Bicycle taillights for dynamo
"Plus" is Busch & Müller's designation for a light with a standlight; "Standlicht" in German. The "Standlight" provides light for several minutes when you stop. The power for the light comes from a capacitor inside the taillight which is charged while the bike is moving. The Toplight Line Plus, Toplight Line Brake Plus, DToplight XS Plus, Toplight Mini, Seculite Plus and 4DLite Plus all have the same "Standlight" feature as the many B&M headlights, except that the light is as bright when you're stopped as when you're riding, since it's the same LED. We sell one dynamo powered taillight that does not have a standlight, the DToplight XS. We sell it for those people who would like to save money. It still has a large reflector area for added safety. So if you think you need to use a battery taillight in order to have a functioning taillight when you're stopped, that's just not the case. The "Plus" taillights remain lit for six or seven minutes after you stop, plenty of time for the light to turn green.

It is what it is , I own one .. and before that has a 4D toplight senso .. which is the same light, minus the Dynamo power input .


Recent buy a B&M Lyt N had no standlight but it was sold cheap.. [Lyt BN is to be the entry level Brompton factory Option a pre wired 2nd input with a plug is included)

there are upscale Lyt Models adding a feature and then more Lumens as the price goes up

if you are4 throwing more than $35 US retail at a wired LED headlight then you get more features ..


The same goes with taillights the 4D Toplight senso plus may be off the latest featured offerings , Its been made for a while,

but if left in the Senso Mode it will turn on when you move and stay on for a few minutes when you stop..

It just takes You turning the switch ... you can also turn it off .. the power is the 2AA batteries ..



Toplight line plus has a button to push to turn it off . it has 2 LEDs and a Fresnel lens to spread out the light , 2 of my bikes run those.


what did you buy , Paul?

Regarding theft or vandalism... you can always break the wire, put plugs there and put the light on a QR handlebar mount. When you park the bike, you can simply detach the light from QR, unplug the wires and take the light with you. I have a couple of bikes with dynohubs and just one light I use between them.

--J

I don't remember exactly the model name, I think it was the DToplight Plus, but I'm not 100% sure. It definitely has a standlight built into it, and it the middle part has a knob that sticks out more than the rest of the light. Honestly, I think it's a little bit ugly, they came out with the Topline Flat after that and I wished I had gotten that one.

As an example of how modern dynamo lights almost always had a standlight, here's the comment from the Peter White site -
Bicycle taillights for dynamo

The DToplight XS is the only dynamo powered taillight I sell that doesn't have a standlight. If you want a standlight, get the DToplight XS Plus instead.

I see he does sell a Lyt without a standlight, here's the price breakdown:
Lumotec Lyt N Plus: $53.00 (2 position On - Off switch & Standlight)
Lumotec Lyt Senso: $50.00 (3 position On - Off - Senso switch, no Standlight)
Lumotec Lyt Senso Plus: $61.00 (3 position On - Off - Senso switch & Standlight)

Looking through his page, it appears that almost all of the more modern models don't have a "no standlight" way to buy them, while a few of the older ones do (not the older Cyo, but the older Fly, and the cheap Lyt that you mentioned), like the availability of non-standlight models is being phased out and they're only selling the standlight models on new stuff.

My suggestion is to never skimp on lights or brakes.
A "good" dynamo led headlight is for the most part a fantastic fit and forget solution.
I roll with an Edelux for its appeal to my aesthetic appreciation but its essentially a shiny eye candy B&M Cyo.
Get the standlight model for safety