more insulative than the first coating system the benefits of emissivity compatibility potentially justify use even where the second coating system is less insulative than the first coating system for example the first coating system may be 1 5 to ten times more insulative than the second thus although the second substrate may operate overall hotter than the first it may suffer lower levels of spatial and or temporal temperature fluctuations fig3 shows an alternate coating system 80 in an area or region 82 of expected high thermal loading e g the region 50 the system includes a low emissivity light tbc 84 e g an emissivity of 0 2 0 5 an exemplary light tbc 84 may be ysz and may be associated with an alumina layer 86 atop the bondcoat 64 e g as disclosed in bornstein et al additional coating layers atop the tbc 84 may also be possible e g as disclosed in bornstein et al in a lower thermal loading area or region 88 a dark tbc 90 may be applied atop the bondcoat 64 e g in similar compositions and the like as the tbc 66 on yet other areas of the substrate not shown subject to yet less heating or thermal loading there may be no tbc or a yet reduced tbc while intact the light tbc 84 helps keep the region 82 cooler than in the system 60 this helps reduce differential thermal loading in the substrate and may help further delay spalling however once spalling occurs it will essentially be limited to loss.