So what is the total lumens for this and what is the dimensions for the height

Hello, the lumens of 1W of this light bar is 140 lumens. For example, the 31'' 90W lumens is 12600 LM. As for the height, it's 3cm.

Can I get it the 43"single row Ultrathin and Ultralight light bar with a black reflector?

Hello, sorry for your inconvenience, this kind of light bar could not add a black reflector. There is another 43" Single Row Cree Led Light Bar and it can add a black reflector. Would you like to consider it, order link: https://www.vividlightbars.com/collections/k-series-single-row-slim/products/43-slim-off-road-led-light-bar

What’s the Lumen output?

Hello, thanks for your inquiry. This lights 1W lumens value is 140 lumens.For example, the 31'' 90W lumens is 12600 LM.