The "Optonica SP4-A2 GU10 4W Warm White" spotlight is great. It has strong light and I am satisfied with its performance so far. The only negative aspect (hence the 3 stars) is that its warm white does not match the corresponding warm white of other GU10 bulbs, even though it states the same color temperature in Kelvin, specifically 2700K. It has a "strange" orange tone, so be careful, anyone who wants to match the color temperature with other GU10 spotlight models will have difficulty, even if it is the same temperature (2700K).