Recommendation for plant light

My enclosure from the top to the substrate level is about 90cm. What kind of plant light do I need is strong enough to provide optimal light to the plants near the substrate level?
I use a UVA plant light that stimulates plant growth, but doesn't add any extra UVB (which I already have). I bought the Exo Terra Natural Light 26W. It is really nice to have the extra light and the plants are definitely growing well.
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