I was also in the area back in August and saw the LED fixtures here and at the Clinton Keith Rd interchange. I did also noticed that Scott Rd still had its LPS fixtures on my way down to meet you and Rick over the weekend. That interchange is scheduled to be re-constructed next year and will likely get new lighting.
CalTrans likely changed them around the beginning of this Summer since they also put the same
type of LED fixtures on Chino Hills Parkway (Part of CA-142 from Carbon Canyon Rd to the 71 freeway) back in June
This area of Riverside County as well as much of San Diego County to the south are located within the "light pollution controlled" zone that once spanned a 45 mile radius from Palomar Observatory. Low pressure sodium lighting was mandated for this area in the late 80's to early 90's in order to avoid interfering with observatory operations as the monochromatic yellow light was less glaring and could be easily filtered out.
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CalTrans likely changed them around the beginning of this Summer since they also put the same
type of LED fixtures on Chino Hills Parkway (Part of CA-142 from Carbon Canyon Rd to the 71 freeway) back in June
This area of Riverside County as well as much of San Diego County to the south are located within the "light pollution controlled" zone that once spanned a 45 mile radius from Palomar Observatory. Low pressure sodium lighting was mandated for this area in the late 80's to early 90's in order to avoid interfering with observatory operations as the monochromatic yellow light was less glaring and could be easily filtered out.