Dark BASIC Professional support as many Hardware Lights as the Hardware does... with DirectX 9.0 Hardware, this is a limitation of 8 (although Modern GPU will typically support up to 32, but I wouldn't recommend using that many; as each Hardware Light comes with a severe performance penalty).
Yet, this is ONLY for Hardware (Transform and Lighting) Lights.
There are two key ways to bypass this limitation.
One way is through Baked Lighting., by that I mean things like Lightmapping (which Dark Lights, developed for FPS Creator provided).
With Baked Lightmaps, there is the limitation that it will only affect Static Geometry... it's possible to create a Projected Lightmap (say for Swinging Lanterns or such) but still you can't really have the Geometry on such Animated as it's akin to Projecting a Shadow or a Decal onto a Surface.
Pixel Shaders are good for Real-Time (Dynamic) Lighting, as you can have more of them... although generally speaking for "Performance" Reasons; it's best to stick to 3 Light Source / Object., and just pass through the most dominant.
Players tend not to notice, but with the advent of things like Real-Time Ray Tracing or Sphere Harmonic Global Illumination., you can portray said subject differences today with Modern Engines but this isn't something FPSC / Dark BASIC Professional can currently do.
In fact it would be difficult in AppGameKit v1 or v2 right now., although Studio (v3) should be more capable of such.
