Velux. SageGlass electronically tintable skylights allow control of the amount of light and heat that enters a room. Applying a safe, low-DC voltage via a control switch, remote, or automatic timer causes the electrochromic layers on the skylight to darken, and reversing the voltage polarity causes the layers to lighten. The skylights have a whole-unit U-factor of 0.49 and an SHGC of 0.10 when the skylight is dark or 0.47 when it is clear. SageGlass is available in select sizes of model FS and model VSE skylights, which are deck-mounted and have wood frames, as well as in select sizes of the aluminum FCM and wood VCE skylights, which are curb-mounted. The skylights are Energy Star–qualified. 800.888.3589.