Mag D lens

[divelights]

I am a newbie and am modifying a Mag D to accept 3 MC-Es with the Polymer Optics 6 degree collimator lenses. My question is - do the collimator lenses need to be in contact with the main cover lens or is it OK if there is a small gap (less than 1 mm)?

It will be used as a dive light so I am not concerned about heat.

Any advice would be greatly appreciated.

 

[DM51]

Welcome to CPF, divelights.

As you are talking about a modification, I'll move your thread to the H&M section.

 

[Alan B]

I am a newbie and am modifying a Mag D to accept 3 MC-Es with the Polymer Optics 6 degree collimator lenses. My question is - do the collimator lenses need to be in contact with the main cover lens or is it OK if there is a small gap (less than 1 mm)?

It will be used as a dive light so I am not concerned about heat.

Any advice would be greatly appreciated.

A small gap should not be a problem.

Make sure you have good thermal path from LEDs to flashlight case. Need to get that 30 watts of heat to the water or .

 

[divelights]

Thanks for that. Makes the overall design easier if tolerance does not have to be so tight.

I intend to screw 3 star mounted MCEs to a 4 mm thick aluminum plate, with thermal grease in between. Then will bond the 4 mm plate into the light head with some form of thermal glue/epoxy. Think this will be enough?

 

[spencer]

I think it does have to touch because the reflector holds the glass in place. Am I wrong? In a dive light it wouldn't be much good if the lens wasn't held in and water came in.

 

[divelights]

No, the body of the light head holds the glass in place. You are right though, it wouldn't be good to have water coming in!!

I already have one light functioning with this glass setup and a halogen bulb so am pretty sure it works. My biggest concern was if a gap between the lens and the glass created some sort of optical distortion - not my area of expertise.

Thanks for the interest.

 

[sailor612]

Can't wait to see the beam shots of 3 MC-E!! I'm doing a similar mod, only with 1 MC-E though...just waiting to place my parts order. I figured about 10W would be plenty for my type of diving...but I definalty wanna see that 30W once your done! Be sure to post pics throughout the mod!!

Who did you order your 6deg optic from?