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Old 16-10-2013, 16:18   #1
Boggy
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PC-ul meu

Default Electronica - Tech Stuff, Proiecte DIY

O sa am mai multe intrebari de pus in timp si nu vreau sa se piarda in Offtopic. Am o nebunie cu LED-urile si am in cap multe proiecte despre care o sa va povestesc. Momentan am o nelamurire, cunostintele mele de electronica de clasa a 2-a trebuie imbunatatite.

Mi-au venit niste led-uri pentru pozitiile de pe masina, CREE Q5. Unul e pus acum pe un transformator de 12V si cu multimetrul legat la el(sa vad daca se incinge prea tare). Are consum de 0.12A la 12V.

Led-ul are specificatiile urmatoare:





Astia nu zic decat 1000mA maxim, nu zic si tipic in spec sheet. Din ce vad eu acolo insa, tipicul e la 350mA unde are flux luminos de 100% (107lumeni).
Ce vreau eu sa stiu e cat primeste LED-ul acum, tinand cont de faptul ca e pus la 12V, si cel mai probabil are o simpla rezistenta in interior. Asta ca sa aflu cam ce output de lumina are.

L.E. Cel mai cald punct pe radiator are 90grade dupa vreo 20-30 min de mers. Asta inseamna ca am flux luminos de ~83% din cat ar scoate la 25grade. Montura de plastic insa e doar calduta la atingere, il pot lua in mana fara probleme. IBM, daca mai esti interesat ne putem vedea sapt viitoare pe undeva sa le vezi. Tinand cont de faptul ca TJ Max e pe la
150grade, eu zic ca e ok.

L.L.E. Daca scoate 120mA @ 12V asta inseamna ~1.45W consum. 1.45W consum ii poate avea doar la 3.3V @ 450mA conform graficului atasat. Asta inseamna ~125 lumeni la eficienta 100% si ~103 lumeni la eficienta 83%(temperatura de 90 grade). Am nimerit-o?
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Last edited by Boggy; 16-10-2013 at 22:06.
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