Dennerle scaper's LED no CO2

[Al404]

I have a dennerle scaper's 50L 45cm length tank
i got 2 LEDDY SMART 6W last year and one of them is already gone, it doesn't turn on any more

I was thinking to change both with a new led lamp / fixture not too bright since i don't run CO2
what can i choose?

would it be 1 Blau 11w Ok? I'm a little worried about the fact that it will be spot in the center

 

[Craigmac104]

Have the same tank, dennerle do a 15w LED fixture for the tank. Costs around £85.

 

[Al404]

do you have CO2? i don't
did you have any algae issue?