Hourglass Ethereal Light is a very cool-toned, very light beige with a natural finish. It is a permanent powder that retails for $48.00 and contains 0.35 oz.
Hourglass Ethereal Light Ambient Lighting Powder ($45.00 for 0.35 oz.) is described as an "opalescent sheer, cool white powder." It's a very light, ivory beige with subtle, cool undertones and a delicate shimmer-sheen finish. MAC Hot Sensation (LE, $26.00) is similar. Cle de Peau Pastel (11) (P, $55.00) is more shimmery. NARS Paloma Highlight (P) is similar. Chanel Jardin de Camelias (LE, $65.00) is warmer. MAC Forever Marilyn (LE, $26.00) is pinker, cooler-toned. Guerlain Mythic (P, $55.00) is more shimmery. Guerlain Clair (02) (P, $62.00) is slightly more luminous. See comparison swatches / compare dupes side-by-side.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
Mica, Synthetic Fluorphlogopite, Boron Nitride, Hdi/Trimethylol Hexyllactone Crosspolymer, Polymethyl Methacrylate, Octyldodecanol, Silica, Benzimidazole Diamond Amidoethyl Urea Carbamoyl Propyl Polymethylsilsesquioxane, Sorbitan Sesquioleate, Magnesium Aluminum Silicate, Phenoxyethanol, Dimethicone, Sodium Dehydroacetate, Sorbic Acid, Polyacrylamide, Benzoic Acid, C13-14 Isoparaffin, Potassium Sorbate, Dehydroacetic Acid, Laureth-7, Ethylhexylglycerin, Trimethylsiloxysilicate. May Contain: Ci 77891 (Titanium Dioxide), Ci 77163 (Bismuth Oxychloride),Ci 77491 (Iron Oxide),Ci 77492 (Iron Oxide), Ci 77499 (Iron Oxide),Ci 75470 (Carmine).
Disclaimer: Ingredient lists are as available by the brand (or retailer) at the time of publishing. Please always check product packaging, if it exists, for the ingredient list applicable to the product you're purchasing, or the brand or retailer's website for the most up-to-date ingredient list.