– 26 – Deriving accurate disk properties from a SED requires detailed modeling because other properties, such as stellar luminosity and disk inclination, can also affect the λ$_{turn}$$_{−}$$_{off}$ and α$_{excess}$ values. The fractional disk luminosity, the ratio of the disk luminosity to the stellar luminosity (L$_{D}$/L$_{∗}$), is another important quantity that relates to the evolutionary status of a disk. On the one hand, typical primordial disks around CTTSs have L$_{D}$/L$_{∗}$ ∼ 0.1 as they have optically thick disks that intercept (and reemit in the IR) ∼ 10% of the stellar radiation. On the other hand, debris disks show L$_{D}$/L$_{∗}$ values ≲ 10 − 3 because they have optically thin disks that intercept and reprocess ∼ 10 − $^{5}$–10 − 3 of the star’s light (e.g., Bryden et al. 2006). We estimate L$_{D}$/L$_{∗}$ for our sample of transition disks 9 using the following procedure. First, we estimate L$_{∗}$ as in Cieza et al (2007), by integrating over the broad-band colors The near and mid-IR luminosities of our transition disks are well constrained because their SEDs are relatively well sampled at these wavelengths. However, their far-IR $^{9}$for completeness, we also estimate analogous L$_{D}$ /L$_{∗}$ values for the likely Be and AGB stars in our sample. given by Kenyon & Hartmann (1995) for stars of the same spectral type as each one of the stars in our sample. The integrated fluxes were normalized to the J-band magnitudes corrected for extinction, adopting A$_{J}$ =1.53 × E(J-K$_{S}$ ), where E(J-K$_{S}$) is the observed color excess with respect to the expected photospheric color. Then, we estimated L$_{D}$ by integrated the estimated disk fluxes, the observed fluxes (or upper limits) minus the contribution of stellar photosphere at each wavelength between λ$_{turn}$$_{−}$$_{off}$ and 1.3 mm (or 850 µ m for targets #12 and 27). The disk was assumed to contribute 30% of the flux at λ$_{turn}$$_{−}$$_{off}$ (e.g., a small but non-negligible amount, consistent with our definition of λ$_{turn}$$_{−}$$_{off}$ ).