A Couple of Q's (maybe stupid q's)

A Couple of Q's (maybe stupid q's)

1. Which bulbs are brighter 9005 or h4 bulbs?
2. My friend bought a coilover system and just installed the springs itself (no adjuster in it just the springs itself), i'm guessing he's in for some bad struts soon right?
:superconf

1) depends on the wattage
2) i'm assuming they're cheap ebay coilovers... he's in for bad struts soon regardless

1) the same as he^^
2) yeah i think pretty soon... al tho they is some people who are lucky... like my frined... he was on the coilover spring only and he never had problems... i had coilover.... and i got problems so it's.... pretty luck al tho all odd are against

they're some dropzone coilover springs on stock struts.

thanks. for th replies. but doesn't lumens also factor into how bright something is or is that just for house lighting?

FYI: Definition of lumen is a unit of luminous flux equal to the light emitted by a uniform point source of one candle intensity.

IE: How much light is emitted.

The power (watts) of a particular bulb is going to be the deciding factor on how bright it appears on the road.

50 lumens at 50 watts is less than 50 lumens at 100 watts.

I thought wattage is a measure of the amount of electrical power required by the lamp to operate at any given instant >> the power going into the lamp.

A lumen is a measure of the amount of light produced by a lamp >> the light coming out of the lamp.

- Fancier definition(SI units) - lumen is defined as the luminous flux emitted into unit solid angle by an isotropic point source having a luminous intensity of one candela.

What we pickup as light is from overall luminous efficacy. That means a 50 lumen bulb at 50 watts has a efficacy of 1.0 (50 lumens/50 watts = 1.0 lm/w) and a 50 lumen bulb at 100 watts has a efficacy of 0.5 (50 lumens/100 watts = 0.5 lm/w).

So >> 50 lumens at 50 watts is GREATER than 50 lumens at 100 watts. Same as saying 100 lumens at 100 watts vs 50 lumens at 100 watts.

This is all good (physics stand point) - unless bulb manufacturers use a different terminology than your standard physics definition:
ie. Radiometry vs Photometry, power per unit area (source)> irradiance vs illuminance, power per unit area (target)> radiance vs luminance.