Quid des ampoules LED retro ? - Page 2

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Re: Quid des ampoules LED retro ?






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surface diminue comme r seulement.



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mon journal, j'en mets ! Ne serait-ce que pour le confort.









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exposition aux UV et cancer de la peau ?



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Connais-tu la puissance surfacique des UV solaires au niveau du sol ?

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OK.



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http://sos-stress.com/wp-content/uploads/2013/07/lechat.jpg

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LL
  ?? ???? ??? ????? ???? (????????)

Re: Quid des ampoules LED retro ?


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tous les jours.


risques qu'ils ont pris.




rendre malades ?
Par exemple on mange des frites. Ne fallait-il pas attendre 50  





Aujourd'hui on doit aussi prendre raisonnablement quelques risques  




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constatable, on n'est plus dans le domaine du raisonnable. Ca ne veut  




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les effets le seraient, en tout cas dans les plages radio couramment  

dimensions des cellules.

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Re: Quid des ampoules LED retro ?






Bonjour

Voir les fontaines lumineuses par exemple.
Mon intuition me dit que ce sont surtout les antennes
qui ne marchent plus du tout.



Re: Quid des ampoules LED retro ?



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gaillardement confondus... Bof, il n'y a pourtant que 10^6 de rapport.


Bravo encore et merci.

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http://archaero.com/

Re: Quid des ampoules LED retro ?




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Ca fait plaisir, merci pour ce retour.

Re: Quid des ampoules LED retro ?


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--  

If computing were an exact science, IT engineers would'nt have work \_o<

"So all that's left, Is the proof that love's not only blind but deaf."
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Re: Quid des ampoules LED retro ?























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maladies de long terme...





Et je te parle pas de la graisse de cheval !




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Je n'ai pas dit qu'il *faut* les supposer (devoir = question morale). Je  
dis que, factuellement, on ne peut pas (? on ne doit pas) les exclure.












   peuvent)

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dans leur spectre).




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puissance radio d'une box Wifi ?

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LL
  ?? ???? ??? ????? ???? (????????)

Re: Quid des ampoules LED retro ?






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avec toi (voir  
https://sciencetonnante.files.wordpress.com/2010/12/spectres.jpg), mais  
du point de vue de l'impression visuelle pour une utilisation  
ordinaire, comme lire.



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visible, les LED pourraient-elles avoir des composantes de niveau  
dangereux ? J'en doute.

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objectifs permettent ou pas l'exclusion, sinon c'est sortir de  


Ces effets ne sont que des inventions, et on peut parfaitement les  



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affirmation.


celui du bleu des LED.

http://www.lesnumeriques.com/electromenager/leds-emettent-uv-dangereux-n49921.html

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mais si. D'abord, voir "effet de peau". Ensuite il y a l'effet  
"antenne" notamment quand les dimensions du corps sont proches de la  


verticalement, pour la bande FM. Je le remarque par exemple quand je me  




voulais voir ce que donnait un conducteur ionique en HF. Il s'agissait  

comme une antenne, comme on le ferait avec un conducteur en cuivre. Si  
















compris l'eau et les tissus humains, entraine des courants de foucault  
et des pertes joule.







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Re: Quid des ampoules LED retro ?



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bleu/jaune est de l'ordre de 0,6 pour la LED, 0,8 pour le Soleil (et 0,3  





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Peu convaincu par l'explication. Aux longueurs d'onde optiques aussi tu  






consomme quasiment rien.






https://en.wikipedia.org/wiki/Electromagnetic_absorption_by_water#Microwaves_and_radio_waves





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--  
LL
  ?? ???? ??? ????? ???? (????????)

Re: Quid des ampoules LED retro ?

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Quand les dimensions du corps sont de l'ordre de plusieurs longueurs  


propagation.
Quand la longueur d'onde est de nombreuses fois les dimensions du  
corps, nous sommes transparent, l'onde passe autour.


stationaires, peuvent se produire.


cm), va  perturber la FM (demi-longueur d'onde comparable au corps,  

courtes (longueur d'onde > 10 m).



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antenne bonne conductrice et en circuit ouvert. Prenons le cas d'un  











On peut voir aussi l'effet du corps-antenne en touchant simplement le  



et trop petite pour les ondes courtes, il nous faudrait mesurer une  
dizaine de m.



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L'eau ultra-pure n'est pas conductrice et je suppose que ces mesures la  
concerne.
Si on parle d'eau ordinaire, ionique, qui donc concerne notre corps  


dit, quand les dimensions de l'obstacle >> longueur d'onde).

Re: Quid des ampoules LED retro ?



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C'est faux .Un bon exemple ce sont les radars meteo.

circulaire .

20 dB d'affaiblissement sur les nuages et la pluie :-)




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C'est vrai qu'en bande FM c'est assez spectaculaire mais je pense que  
l'effet
de seuil et de capture jouent beaucoup.



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La aussi se mefier de l'effet de seuil.
Parfois on a une amelioration aussi spectaculaire en branchant l'alim
ou un casque par effet de "contrepoids".




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"C'est faux" quoi ?







Re: Quid des ampoules LED retro ?


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Que des corps petits devant la longueur d'onde sont transparents.



Re: Quid des ampoules LED retro ?
On 21/04/17 22:18, bilou wrote:

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--  

If computing were an exact science, IT engineers would'nt have work \_o<

"So all that's left, Is the proof that love's not only blind but deaf."
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Re: Quid des ampoules LED retro ?


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Les corps petits devant la longueur sont transparents.


macro qui n'est plus transparent quand ses dimensions sont de l'ordre  
de grandeur de la longueur d'onde (nuage). On se sert d'ailleurs de ce  






Neptune/Soleil).

Re: Quid des ampoules LED retro ?







Il n'y a pas de vide dans un atome. Il est rempli par les ondes  




--  
LL
  ?? ???? ??? ????? ???? (????????)

Re: Quid des ampoules LED retro ?


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Enfin en classique, les champs se superposent, les ondes ne se font pas  

ne sais pas...




Re: Quid des ampoules LED retro ?


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Enfin en classique, les champs se superposent, les ondes ne se font pas  

ne sais pas...




Re: Quid des ampoules LED retro ?






https://commons.wikimedia.org/wiki/File:HAtomOrbitals.png

Sinon, je ne vois pas ce que tu veux dire.


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Je ne vois pas le rapport.








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d'exclusion de Pauli...

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LL
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Re: Quid des ampoules LED retro ?




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les scientifiques?

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