Lampe
"Allumer la lampe." You could also point to the lamp and say "allume, s'il te plaît."
a lamp is spelled "une lampe" in French. a lampshade = un abat-jour a street lamp = l'éclairage public
To say "light" as in a light color in French, you can use the word "clair."
lampe de génie
if you wanted to say small, then little but if you wanted to say light as in not heavy or a lamp or something then it would be light.
Both are acceptable with different meaning. I read by the light of the lamp means I use the lamp to light the pages so that I can read them. I saw it in the light of the lamp means it was visible in that pool of light caused by the lamp.
Light emitted by any light source - say, by a lamp, or by the Sun - travels in all directions.
The Lamp Lighting ceremony is a tribute to Florence Nightingale, who is the founder of modern day nursing. It represents the light and enlightenment that come with knowledge. The Nurses light the lamp, and then say a pledge of service.
In French, "light blue" is translated as "bleu clair."
a light skin (in the sense of "fair complexion") is 'peau claire' in French.
leger = light
"Ugly lamp" in English is lampe laide in French.