Diving lamp prototypes

Powerful custom lamp

The range of diving lamps is very broad and they can be bought on different price levels and specifications. However, sometimes diving photographers need custom solutions. Prototypes designed and manufactured in Hecada are oriented for great lightning power, which of course needs clear water.

Therefore, powerful portable spotlight finds even more use out of the water but the limitation is here much lower air cooling factor.

Prototype v1

The first prototype is made of acid proof stainless steel and hard coated aluminium. It is very rugged and durable but quite heavy. The housing includes 2 spotlights, larger main light on centre and auxiliary light on top of it. The main spotlight uses Bridgelux Vero most powerful LED-matrix which needs a good heat exhanger. Therefore the brightest light is usable only on water, automatic regulator dims the light based on temperature. To prevent leaks, permanent magnet switches are isolated outside the housing. 12-cell Li-battery provides 1 h of working time. The first prototype had a successful dive in Red Sea up to the maximum limit allowed for hobby divers.

Sukeldumislambi prototüüp v1

Sukeldumislambi prototüüp v1

Prototype v2

The next prototype is much lighter and with smoother shape. The new housing consists on aluminium and carbon fiber parts which are assembled with O-ring seals. For universal use, the handle can be easily removed. The spotlight is again Vero LED-matrix and there is a possibility to use different reflectors and lenses. Use in photography requires to divide the lightning power evenly to as large area as possible. The energy source is again 12-cell Li-battery but as an improvement, the battery charger and indicators are built into lamp. Although this prototype is a significant improvement, the next version needs integration of high durability with simple shapes and light weight.

Pressure test chamber

Leakage resistance under pressure is definitely the first requirement for an underwater electrical device like diving lamp. The sealing must be checked according to use condition limits but testing in real conditions is also very expensive and hazardous. There is a great chance to break the device while the source of leakage is not known.

The better way is to use pressurizing equipment in laboratory which enables to detect exact pressure and location of leakage. Internally reinforced pressure tank is made of stainless steel and windows from 15 mm plexiglass. The chamber volume must be high enough that the device being tested won’t touch water initially. There is enough water that it will cover the device when the chamber is turned around. While adjusting the pressure, possible leaks can be identified by air bubbles. It is very easy to conduct endurance tests, for example hold the device under pressure for 24 h. In photo below, it is seen the prototype v2 in chamber at 4 bar pressure. Although the front window was bent to concave, the seals and glued contact surfaces holded nicely during 24 h test.