Jess
That is exactly what I was talking about , although I also understand that some LEDs do not have that issue. Don't know the reason behind it but some LEDs seem to be ok during the day.
Jerry
Don't give up,
they might be just fine, but I think you should place an order before August so we can see for ourselves

Now I have one of the LED arrays with 80 bulbs or so that is a plug and play in one of my valk tail lights, and you can see that in daylight just fine (and it's old, but it must be the 80 bulbs). But that Hog has dual OE tail lights like small turn signals, so I'm thinking single bulbs. They are OK even in overcast or partly cloudy daytime, but in bright direct sun, they just disappear.
I bought some Kuryakyn small silver bullet 2-stage led lights to add to a Yamaha 1100 where the aftermarket hard bags I added interfered with the large OE lollipop (bulb) signals, and those were also plenty bright in daylight, but again, though very small, they had an array of multiple bulbs. I had all kinds of problems getting them to work properly because of Yamaha common ground issues (even with a new electronic flasher unit). They had to be signals, and with two stage, I wanted turn and brake lights, but I had to settle for turn and run lights.
I agree with Jack.. even some single bulb LEDs may be fine in daylight (today), with newer technology, and brighter bulbs (I dunno)? When I went to Kuryakyn just now to look the silver bullets up I saw them talking about some new(er)
Superbright LEDs. Maybe these are new single bulb leds... I'm no expert.
After my experience of weeks of trying to get those silver bullets to work properly on that Yamaha, I decided I would never use leds in signals again. But that's my lousy auto electrical ability, not the lights.