I have visual snow syndrome & migraines. It sometimes causes me to be extremely photophobic to artificial lights. I found out red light doesn't trigger my photophobia which is why I got this, the reviews look OK. To my disappointment it is another cheap generic that most likely uses a full coloured light, with piece of red plastic on the outside. I know it is not pure red because I have an Amazon Echo Glow which is a known pure red light source. Compared to my Echo Glow, this light bulb looks to be orange. It is a lot brighter than my Echo Glow. Also under this light, I can see the colours yellow, orange, and a small amount of green. I can't seem to see the colour blue under this light. It is not pure red, but close enough, and it is very bright. It definitely hurts my eyes a little bit because it is not pure red (my Echo Glow doesn't sting my eyes), but it's OK.