No angling a light so it shines in sideways. Imagine living with constant dawn or dusk light in your eyes. It won’t blind them but it will annoy the hell out of them.

You say your cage has a solid top? I assume you mean it is a play top and has a debris tray in the top slot.

TAKE OUT THE TRAY!!!  Problem solved. There is no reason to leave the tray in place. The small amount of debris and droppings is minimal.

Regarding the lighting and UVB, etc.

It has been disproven that birds get any form of vitamin supplement from lights no matter the voltage, UVB/UVB, etc.

This is because reptiles absorb light through their skin whereas a bird’s skin is obscured byt its feathers

If you want Vitamin D, you must give it to them via vitamin supplements. Nekton S

It may work for reptiles who have bare skin, but then so, it may not help them much either. Reptile owners usually dust their worms and crickets, etc with vitamin powder before feeding them.

What IS important is the brightness. A good Full Spectrum (even without all the UV, etc) or a plant light will work well for your birds.

A bright light simulates the sun in Australia so having one as close to the top of your birds cage (or just above their heads on a play top) on a timer, set for 12 on and 12 hours off, will help your bird’s feel like it is summer in Australia and be able to forgo hormonal changes that occur when they are kept in dim conditions too much.

It does not have to be the most expensive bulb out there, nor the highest wattage.

I hope this helps.