Não é especificamente declarado que as árvores usaram a luz das lâmpadas.
O Valar Yavanna os criou, sua fonte de luz era deles mesmos, sem mencionar o uso das lâmpadas existentes.
And when Valinor was full-wrought and the mansions of the Valar were established, in the midst of the plain beyond the mountains they built their city, Valmar of many bells.
Before its western gate there was a green mound, Ezellohar, that is named also Corollairë; and Yavanna hallowed it, and she sat there long upon the green grass and sang a song of power, in which was set all her thought of things that grow in the earth.
But Nienna thought in silence, and watered the mould with tears. In that time the Valar were gathered together to hear the song of Yavanna, and they sat silent upon their thrones of council in the Máhanaxar, the Ring of Doom near to the golden gates of Valmar, and Yavanna Kementári sang before them and they watched.
And as they watched, upon the mound there came forth two slender shoots; and silence was over all the world in that hour, nor was there any other sound save the chanting of Yavanna.
Under her song the saplings grew and became fair and tail, and came to flower; and thus there awoke in the world the Two Trees of Valinor.
The Silmarillion - Of The Beginning of Days
A Lua e o Sol foram a última flor e a última fruta de Telperion e Laurelin respectivamente que foram criados quando Yavanna e Nienna cantaram e chorou após sua destruição por Ungoliant
Além disso, uma vez que os Silmarils são criados, há a seguinte descrição deles.
And the inner fire of the Silmarils Fëanor made of the blended light of the Trees of Valinor, which lives in them yet, though the Trees have long withered and shine no more.
Of the Silmarils and the Unrest of the Noldor
Se as árvores foram feitas a partir da luz das lâmpadas, você pode ter esperado uma menção deste link para as lâmpadas.
No entanto
Existe a seguinte passagem que descreve a saída de Almaren (ênfase minha)
Behind the walls of the Pelóri the Valar established their domain in that region which is called Valinor, and there were their houses, their gardens, and their towers.
In that guarded land the Valar gathered great store of light and the fairest things that were saved from the ruin; and many others yet fairer they made anew, and Valinor became more beautiful even than Middle-earth in the Spring of Arda;
The Silmarillion - Of The Beginning of Days
O que sugere que a luz das lâmpadas pode ter sido salva. Embora o resto do mundo tenha ficado na escuridão.
But all Middle-earth lay in a twilight under the stars. While the Lamps had shone, growth began there which now was checked, because all was again dark.
Of the Coming of the Elves and the Captivity of Melkor
Novamente, nenhuma menção é feita à luz sendo usada na música de Yavanna
De acordo com
A respeito de por que Yavanna usaria a mesma luz que as lâmpadas emitiam se ela não tivesse a luz existente?
Talvez os Valar quisessem uma lembrança de Almaren antes que Melkor destruísse tudo o que haviam criado. Um pedaço do mundo antigo deles que eles nunca serão capazes de recuperar.