Lambda fibers are provided in packs of five implantable fiber cannulae defined by the Fiber Type (i.e. numerical aperture and core size of the untapered optical fiber), the Active Length, the Implant Length, and connector type:
To switch from your flat-end fiber with length L to the Lambda fiber, you need a Lambda fiber with Implant Length= L and to select the Active Length which best matches the size of your target area.
Download LightSpread software to estimate how the light emitted by a Lambda fiber is distributed in the brain tissue [1, 2].
 L. Wang, et al., “MCML—Monte Carlo modeling of light transport in multi-layered tissues“, Computer Methods and Programs in biomedicine (1995).
 J. M. Stujenske, et al., “Modeling the spatiotemporal dynamics of light and heat propagation for in vivo optogenetics“, Cell Reports (2015).